The Minnesota Vikings are trying to determine why wide receiver Jerome Simpson woke up with numbness and weakness in his lower left leg before Sunday's game against Tennessee.
Coach Leslie Frazier said Simpson was undergoing MRI tests on Monday. Simpson played in parts of Minnesota's 30-7 win, but he didn't catch any passes. He had trouble pushing off because of the injury, which Frazier said could also be connected to his back.
Frazier said Simpson was "alarmed" by his condition but that the Vikings don't believe he's facing a long-term absence.
Running back Adrian Peterson suffered a mild sprain of his left ankle that he played through. Frazier said the Vikings don't see "anything that will keep him from playing" on Sunday at Washington.