Foster is currently on-loan at Premiership side Watford.
He said: “I’ve bought a house on the outskirts of Manchester and want to settle down with the club.
“I have been told by United they are so pleased with my progress they are ready to improve my contract.
“I want to be at Old Trafford. That’s my club and I’m ready to stake my claim. I want to renegotiate and settle down to focus solely on my United career.”