Washington Redskins starting running back Tim Hightower is scheduled to have an MRI Monday on his injured left knee, and although he doesn’t yet know the severity of the problem, he said he is “determined to come back” this year.

Meanwhile, receiver Santana Moss said he doesn’t know how long his broken left hand will keep him out, but refused to let the injury discourage him.

Hightower, who rushed for 88 yards on 17 carries before going down with the injury, had to be helped off the field early in the third quarter after he was hurt while being tackled at the end of a 4-yard gain.

After he was tended to by trainers, Hightower tried to walk off the field, but couldn’t. Receiver Donte Stallworth and fullback Mike Sellers helped carry him off the field.

Hightower said he didn’t feel a pop, and was optimistic that he hasn’t torn his ACL, but Redskins coach Mike Shanahan said the team won’t know until Monday exactly how bad the injury is.