Matsui had surgery in Houston on March 17 to repair an anal fissure and was given an estimated recovery time of two to three weeks. He returned to Kissimmee, Fla., on Sunday and will be with the Astros through the club's remaining days of in Florida.
The Astros made two other roster moves in the last 24 hours. Following their game on Monday in Jupiter, they reassigned catcher Josh Johnson to Minor League camp, and prior to leaving for Lakeland for Tuesday night's game with the Tigers, they optioned right-hander Ryan Houston to Triple-A Round Rock.
The Astros have 34 players remaining in big league camp.
Alyson Footer is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.