Fri 9/19/14 12:21 PM

McCown (thumb) has an MRI on tap Friday, NFL Network's Ian Rapoport reports. The report notes that McCown's thumb is believed to be sprained, but in any case, his injury, coupled with the Bucs' 0-3 start, could potentially lead to the team considering a move to Mike Glennon in Week 4's game against the Steelers, which takes place on Sept. 28.