12/24/2011 11:01 EST | Updated 02/23/2012 05:12 EST

Vikings' Adrian Peterson has torn ACL in left knee; Ponder suffers head injury

LANDOVER, Md. - Minnesota Vikings running back Adrian Peterson tore a ligament in his left knee Saturday after taking a direct hit in a 33-26 win over the Washington Redskins.

An MRI showed the anterior cruciate ligament tear after the team returned to Minnesota.

Peterson said he knew "it was something bad" the moment he was hit and that he was in "severe pain" on he lay on the field. He was hurt when tackled by Redskins safety DeJon Gomes at the end of a 3-yard gain on the first offensive play of the second half.