He said: "I knew I was going to be here for the year and I moved into a house as quickly as possible to try and get some roots down.
"I want promotion more than anything, that's what is on my mind at the minute. I'm open-minded about the summer. It's down to the manager whether he wants to sign me. Nothing's been said.
"I've two years left on my Sunderland contract so we will just have to see what happens. They are keeping an eye on me."
Blades boss Kevin Blackwell said: "Greg's a nomad. It's the first time he's been at a club for 12 months in three or four years.
"He's been doing six months here, six months there and never felt settled. Greg's a talented kid and I'm not sure he realises how good he can be."