The 18-year-old American defender joined United from the New York Red Bulls' academy in January, but his signing was not announced until last month after international clearance was received.
Celtic and Rangers meet this weekend in the latest Old Firm derby.
Forshaw was the match-winner as Middlesbrough leap-frogged Burnley to top the Championship.
Leeds United beat Birmingham City 2-1 at Elland Road yesterday evening.
Everton and Watford have both reportedly scouted Lee Jae-Sung recently.
The two defenders have had question marks over their fitness, forcing Ronny Deila to provide an update.
David Moyes is one of the favourites to become Aston Villa's next manager.
West Ham United are set to take on Manchester United in the FA Cup later this evening.
The Nancy keeper is yet to play a senior fixture but has been on the bench for his club.
United are 14 points clear of the Championship's bottom three.