Infante played four innings on Thursday in a rehab start for Class A West Michigan before leaving the game. He was originally expected to play six innings.
"One more week, two more weeks, I think I'll feel better," Infante said on Friday.
Infante, on the 15-day disabled list, has been out since July 3, when he sustained the injury on a hard slide by the Blue Jays' Colby Rasmus.
Bobby Nightengale is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.