Lions C Frank Ragnow (knee) to undergo MRI exam

(Photo credit: Stephen Lew-USA TODAY Sports)
Detroit Lions standout center Frank Ragnow will undergo an MRI exam on his left knee on Monday.

The two-time Pro Bowl selection was injured in the second quarter of Sunday's 33-28 win over the New Orleans Saints.

Ragnow was blocking on a running play when another player was blocked into his leg. He was helped off the field by trainers before being taken via cart to the locker