Houston Texans running back Joe Mixon is having an MRI on his ankle, NFL Network reported Monday, an injury he says happened on a now-banned hip-drop tackle in Sunday night’s win over the Chicago Bears.No flag was thrown on the play.Mixon was injured in the third quarter after a tackle by Bears linebacker T.J. Edwards. Mixon returned but ran the ball just once more on seven snaps after returning later in the half.”The NFL and NFLPA made it a rule and an emphasis for a reason. Time to put your money where your mouth is,” Mixon posted to X early Monday.Mixon finished with 25 yards rushing on nine carries and caught three passes for 25 yards.