Exeter City defender Josh Key says he is using speculation linking him with a transfer away from the club to improve his performances.
Sunderland have reportedly had a bid in excess of £1m rejected by the League Two side, with Key still having two years left on his current deal.
"It's nice to know that there are people interested in your style of play and who you are as a player," Key said.
"It give you confidence to really push forward," he told BBC Sport.
"Any young player wants to be recognised by other teams as a good player.