Coach Jim Zorn says Haynesworth has a strained glut muscle high in the hip area. The team says Haynesworth was having an MRI exam in Tennessee, where he was also taking care of a personal matter.
Asked about Haynesworth on Monday, Zorn said: "I think he's going to be fine."
Haynesworth was carted off in the first half of Sunday's 19-14 loss, but he returned and played much of the second half.
Haynesworth signed a seven-year contract, $100 million contract in the offseason.
Copyright 2009 by The Associated Press