Manchester - Manchester United manager Louis van Gaal says captain Wayne Rooney will have a scan on his injured right knee on Wednesday.
Read: United saved by De Gea
The England striker missed United's 2-1 win over Stoke on Tuesday with the injury he sustained by sliding into an advertising hoarding during the 3-0 victory over Hull on Saturday.
Van Gaal told reporters: "in my opinion, it is not so heavy but I am not a doctor. We have to wait (for) a scan and we will know more."
Manchester United moved within one point of third-placed Southampton but the Saints have a game in hand over the Red Devils.
Van Gaal will take his side to Southampton on Monday for a crunch English Premiership fixture.
Did you read: Blind ready to return