The Cincinnati Bengals warmed up Thursday morning with Joe Mixon noticeably missing.

Mixon wasn’t on the injury report the day prior and nothing had been announced, so the fact the team’s running back was simply missing in action was odd.

The Bengals later added Mixon to the Thursday injury report with a knee problem:

Of course, it’s hard to forget Mixon was at one point sitting on the bench by himself during the blowout loss to the Saints. He had been running well on the team’s first drive before getting yanked in favor of Giovani Bernard. He ended up only rushing 11 times despite averaging north of five yards per carry.

Mixon had his knee scoped after playing hurt late in a win earlier this season and missed a few games. If he’s re-injured the same knee (no confirmation yet), it could be a nagging problem that shelves him next to A.J. Green during this weekend’s game against the Ravens.