A league source told ESPN NFL Insider Adam Schefter that X-rays on Hightower's knee were negative and the fourth-year back was scheduled undergo an MRI.
Moss hurt his left hand in the first half and spent the rest of the half watching from the sideline while wearing a bulky wrap on the hand.
Hightower -- who got the start and had run for 88 yards on 17 carries -- hurt his left knee on a 4-yard carry in the third quarter. He was helped off the field and eventually carted to the locker room from the sideline. Neither player returned.
Entering play Sunday, Moss led the Redskins with 23 receptions. He also had 284 receiving yards and two touchdowns.
Information from The Associated Press was used in this report.