The Blades are believed to have made an undisclosed bid for the 22-year-old and he is unsure of where he will be next season, with Southampton the subject of a takeover bid from the Pinnacle Group.
He told BBC Radio Solent: "I haven't thought about it too much until it actually moves forward. Until the takeover at Saints goes through, then we're in a bit of limbo.
"At this stage I haven't thought any further than going back to Southampton for pre-season on 22 June.
"When a serious bid comes in then that's when you have to review your situation, but we're not at that stage yet."