Infante says that he ran on Monday before taking grounders and participating in batting practice on Tuesday.
"I would not be surprised if by the end of the weekend that he's out on injury rehab," president/general manager Dave Dombrowski said, "but it has lingered longer than we thought it would."
If all goes well with Infante's rehab, he may be able to rejoin the Tigers during the team's upcoming 10-game road trip beginning next Monday in Cleveland.
Jason Beck is a reporter for MLB.com. Read Beck's Blog and follow him on Twitter @beckjason. Bobby Nightengale is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.