Great news for Watford fans. Tom believes he's good enough for the Premier league but it's great to keep him at Vicarage Rd until the end of this campaign.
Malky Mackay told the club's official website: "I'm delighted to have secured Tom's services until the end of the season.
"The business was once again conducted in a correct and professional manner with Tom, his representative and Manchester United.
"Sometimes it can take time for a player to settle in, but, Tom has hit the ground running.
"That is down to Tom's hard work ethic, his desire and professionalism. It also a reflection upon the club he has come from, while the coaches here have had a big part to play as well since his arrival."