Simpson first noticed the issue Saturday night, and although he attempted to play Sunday, he was unable to perform at a high level. Head coach Leslie Frazier said that the tightness severely limited Simpson, according to Ben Goessling of the Pioneer Press:
"He wasn't able to really push off and didn't feel like he had the strength in his lower leg. We have to try to find out why (that is) the case."
Simpson will undergo tests Monday, according to KFAN 1003 in Minneapolis.
Running back Adrian Peterson says he twisted his ankle on the second play from scrimmage Sunday, and the injury limited his performance for the rest of the game. Peterson still finished the game with 17 carries for 88 yards. He is not expected to miss any time as a result of the injury.
Safeties Mistral Raymond and Andrew Sendejo missed Sunday's game with ankle injuries.
Quarterback Christian Ponder played Sunday's game with a sore knee, but it should not affect him moving forward. Ponder says that the injury is not serious and did not affect his play.