Puk (elbow) will throw another simulated game Friday, Susan Slusser of the San Francisco Chronicle reports.

Puk (elbow) tossed a simulated game Monday at extended spring training, Susan Slusser of the San Francisco Chronicle reports. "It went really well and I feel great," Puk said after the session. "So far it's been clear sailing and hopefully it stays like that up until the finish line."

Puk (elbow) has thrown to hitters on multiple occasions recently, Susan Slusser of the San Francisco Chronicle reports.

The A's are hoping Puk (elbow) will be ready for game action sometime in June, Tyler Maun of MiLB.com reports.

Puk (elbow) was reassigned to minor-league camp Saturday, Jane Lee of MLB.com reports.

Puk (elbow) is scheduled to throw a bullpen session Tuesday, Jane Lee of MLB.com reports.

Puk (elbow) is hoping to return around the midway point of the 2019 season, Julian McWilliams of The Athletic reports.

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Oakland Athletics pitching prospect A.J. Puk (elbow) had successful Tommy John surgery on Tuesday, according to Susan Slusser of the San Francisco Chronicle. In spring training, Puk was looking good and was competing for a starting rotation spot. He had a 3.38 ERA in 10 innings with seven strikeouts. Puk is expected to miss 12 to 18 months, so he should return around the middle of 2019. While most have been successful in recovering from TJ surgery, there is still risk. Puk is a good prospect and should only be held onto in deep dynasty leagues.

Puk (elbow) underwent successful Tommy John surgery Tuesday, Jane Lee of MLB.com reports.

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Updating a previous report, Oakland Athletics pitching prospect A.J. Puk (elbow) was recommended to have Tommy John surgery, according to Jane Lee of MLB.com. Puk sought a second opinion from well-known orthopedic surgeon, Dr. James Andrews, after receiving news Tuesday that he had ligament issues in his pitching elbow. He would be the second young pitcher for the Athletics to have Tommy John surgery this season if he has the procedure done. It is a big loss for a pitching prospect who was having a great spring and on the verge of making the starting roster. With roughly a 12-14 month recovery period, Puk can be dropped in all redraft leagues.

The A's announced Tuesday that Puk (elbow) has been recommended to undergo Tommy John surgery on his left arm, Julian McWilliams of The Athletic Bay Area reports.

Puk (biceps) is seeing doctors about a potential issue with the ligament in his elbow, Jon Heyman of FanRagSports.com reports.

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Oakland Athletics pitching prospect A.J. Puk could potentially have pitching elbow ligament issues, according to Jon Heyman of FanRag Sports Network. A week ago, Puk was shut down after being diagnosed with biceps soreness. This was after he was having a great spring that gave manager Bob Melvin consideration on whether Puk should stay with the club as a starter. Ultimately, a couple of poor outings and then the biceps soreness concerns caused the team to investigate the cause more thoroughly. The Athletics are already having issues with the health of their starting rotation and another loss would just compound the issue and add salt to the wound. This would also be a devastating loss not only to redraft hopefuls, but also dynasty league managers anticipating finally cashing in on the expectations of the sixth overall pick in the 2016 draft.

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Oakland Athletics pitching prospect A.J. Puk (bicep) has been shut down with biceps soreness, according to Susan Slusser of the San Francisco Chronicle. Puk had an MRI and there was no indication of any major structural damage. Since the injury does not appear to be serious, the Athletics are just taking every precaution, considering recent injuries to the rotation. Puk should be back on the mound in the near future. He will start the season in the minors after having a good spring, allowing four earned runs with seven strikeouts in nearly 11 innings. Puk should be owned in all dynasty leagues and will be up at some point this year.

Puk was shut down with biceps soreness Wednesday, Susan Slusser of the San Francisco Chronicle reports.

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Oakland Athletics pitching prospect A.J. Puk was one of the roster cuts made on Sunday, as reported by Jane Lee of MLB.com. Puk was having a productive spring with a 3.38 ERA over 10 innings with seven strikeouts but six walks. The intent is for Puk to get more refinement and consistent playing time in the minors, as he only has 64 innings at Double-A. There is no doubt that Puk is a part of the Athletics rotation of the future. For now, those in redraft leagues can leave Puk on the waiver wire but keep him on the watch list.

The Athletics reassigned Puk to their minor-league camp Sunday, Susan Slusser of the San Francisco Chronicle reports.

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Oakland Athletics pitching prospect A.J. Puk had a rough night against the Mariners on Thursday. He pitched 2 2/3 innings, striking out one batter, but he allowed four earned runs and three walks. The first two innings went well, but Puk was just overworked in the third inning, throwing nearly 40 pitches. Puk is in competition for a spot in the rotation, considering Jharel Cotton's recent injury, and this will leave a bad taste in Oakland's mouth. With this outing, Puk will surely start the season in the minors. Keep an eye on Puk, as the rotation is not without flaws. He will be on the active roster at some point this year.

Manager Bob Melvin didn't completely rule out the idea of Puk breaking camp on the Opening Day roster, Julian McWilliams of The Athletic Bay Area reports. "Who knows," said Melvin when the question of Puk opening the year in the big leagues was posed to him.

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Oakland Athletics top pitching prospect A.J. Puk had a very good spring training game Friday against the Brewers. He pitched three clean innings and struck out two but also gave away two free passes. John Shea of the San Francisco Chronicle reported that when asked if Puk would be on the season-opening roster, manager Bob Melvin said, "Who knows." It appears the manager is not ruling out the possibility, particularly given that the Athletics starting rotation might have a spot open for competition. Puk should be owned in all dynasty leagues. Check your league to make sure.

Puk fired three scoreless innings in Saturday's 10-4 Cactus League loss to the Padres, allowing an unearned run on a hit and a walk while recording three strikeouts.

Puk will attend the Athletics' spring training as a non-roster invitee, Jane Lee of MLB.com reports.

Puk (2-3) allowed an earned run on five hits and two walks over six innings for Double-A Midland against Arkansas on Sunday. He struck out seven.

Puk, 22, struck out 13 batters last Thursday in a start for Double-A Midland.

Puk was promoted to Double-A Midland on Thursday, Jane Lee of MLB.com reports.

Puk didn't allow a hit through 5.1 innings in High-A Stockton's win over Lake Elsinore on Monday but gave up an earned run on a fielder's choice, Mike Rosenbaum of MLB.com reports.

Puk was dominant over four innings in his debut for High-A Stockton in Monday night's win over Modesto, Meghan Camino of MiLB.com reports.

Puk was reassigned to minor league camp Sunday, Jane Lee of MLB.com reports.

Puk earned his first hold of spring in Tuesday's 5-4 Cactus League victory over the Indians by striking out the side in his one inning.

Puk, the 2016 sixth overall pick, impressed Friday while facing hitters for the second time, Joe Stiglich of CSN Bay Area reports.

Puk, the sixth overall pick in the 2016 first-year player draft and non-roster invitee, made a strong impression on manager Bob Melvin in his first bullpen session of spring training, Joe Stiglich of CSN Bay Area reports. "Early in spring you're looking for fastball command, and he had command of that," Melvin said. "He showed a good changeup. I know his breaking ball came a long way last year. He's one of those guys that's free and easy. He's closer to you once he releases the ball (because of his height) and he's got good life on him. It's a good start for him to have a good showing in his first bullpen."

Puk, the sixth overall pick in the 2016 first-year player draft, will be a non-roster invitee to spring training, David Schoenfield of ESPN.com reports.

Puk made his first start for the Athletics organization, pitching two scoreless innings for Short-A Vermont.

The A's have selected Puk with the sixth overall pick in the 2016 first-year player draft.