HOUSTON -- Astros All-Star shortstop Carlos Correa underwent surgery Wednesday morning to repair a torn ligament in his left thumb. Correa posted a picture on his Instagram page Wednesday, writing: "Successful Surgery, now ready for what's next."

Correa is expected to be out six to eight weeks after injuring his thumb swinging the bat in the fourth inning of Monday's game against the Mariners. He originally hurt his thumb sliding into home plate July 4 in Atlanta and was playing through pain before tearing the ligament Monday.

The 22-year-old was having an MVP-caliber season for the Astros, hitting .320 with 18 doubles, 20 home runs and 67 RBIs in 84 games. Before getting injured, he ranked second in the American League in RBIs, tied for second in multi-hit games (33), third in WAR (4.8), fifth in batting average, fifth in OPS (.966) and fifth in runs scored (64).

Marwin Gonzalez started at shortstop for the Astros for the second consecutive game Wednesday, but manager A.J. Hinch said prior to the game that Alex Bregman would play shortstop this weekend in Baltimore. Colin Moran, who was called up Tuesday, will see time at third when Bregman and Gonzalez are playing other spots.