Santillan will open the year at Double-A Chattanooga, Jonathan Mayo of MLB.com reports.

Santillan was sent to minor-league camp Tuesday, Bobby Nightengale of The Cincinnati Enquirer reports.

Santillan was invited to Cincinnati's major-league spring training camp Wednesday.

Santillan has been dominant at Double-A Pensacola since his promotion, including a 5.2-inning scoreless outing Monday night where he struck out 11 batters, the Reds' official site reports.

Santillan was promoted to Double-A Pensacola on Thursday, Doug Gray of RedsMinorLeagues.com reports.

Santillan gave up one run on six hits and a walk and struck out six over 6.2 innings to pick up the win Sunday for High-A Daytona in the club's 5-1 victory over Dunedin.

Santillan tossed six scoreless innings Wednesday, allowing one hit and two walks while striking out eight for High-A Daytona.

Santillan has thrown 11 consecutive scoreless innings for Low-A Dayton, including five shutout frames Friday against Fort Wayne, where he struck out eight.

Santillan (shoulder) picked up the win in his return from the disabled list Friday, allowing three runs in 6.1 innings pitched while fanning seven and walking just one batter.

Santillan was placed on the 7-day DL on Thursday at Low-A Dayton with shoulder stiffness.

Santillan was promoted to Low-A Dayton earlier last week and was named to the Pioneer League All-Star Game, though he won't participate in that, Better Off Red reports.