Henderson missed practice on Thursday. Coach Leslie Frazier said Henderson woke up in the morning with swelling and the team thought it would be "wise to hold him back." Henderson participated in practice on Wednesday without problems, and the Vikings weren't sure how he got hurt.
Frazier says he won't be concerned about Henderson if he can practice on Friday.
In his place, younger brother Erin Henderson and recently acquired Xavier Adibi took turns on Thursday at middle linebacker. Kenny Onatolu also saw time at weakside linebacker, where Erin Henderson has been playing.
The Vikings host the Tampa Bay Buccaneers on Sunday.