Buffalo Bills quarterback Thad Lewis returned to practice Friday but is listed as doubtful to play Sunday against the Kansas City Chiefs because of a rib injury.
Lewis was injured during the Bills' last game, a loss to the New Orleans Saints. He missed practice Wednesday and Thursday due to sore ribs.
"We're trying to hold out to see if Thad will be ready," coach Doug Marrone said.
If he cannot go, the Bills will likely turn to Jeff Tuel over recently-acquired Matt Flynn.
Lewis was 22-for-39 passing for 234 yards with a touchdown and an interception against the Saints. He was sacked four times.