Minnesota Vikings outside linebacker D.J. Wonnum has a partially torn quad and will likely need surgery, a source confirmed to ESPN on Monday.
Wonnum's hip flexor has remained intact, however, and he is seeking a second opinion, the source said.
The Vikings are also bracing for bad news with tight end T.J. Hockenson, sources told ESPN's Jeremy Fowler, who is having an MRI exam on Monday on his right knee.
Wonnum left Sunday's 30-24 loss to the Detroit Lions after sustaining the non-contact injury to his left leg while he was attempting to rush the passer in the fourth quarter.