Sunderland manager Martin O'Neill has refused to comment on potential interest in Steven Fletcher but does want to improve his goalscoring options.
Amid reports linking him with a move to the Stadium of Light, Wolverhampton Wanderers striker Fletcher on Wednesday confirmed he has handed in a transfer request.
Relegated Wolves are refusing to let the 25-year-old leave until their valuation is met and they have already rejected bids.
Sunderland could be one of the clubs to have made an offer, with O'Neill previously admitting he has made approaches for a 'number of players'.
But the Black Cats boss did not want to discuss Fletcher, who has scored 22 Premier League goals since joining Wolves in 2010, after Wednesday's pre-season friendly draw against Derby.
O'Neill would only say to Sky Sports News: "We have certainly in pre-season found it a bit of a problem scoring goals.
"But I think we can rectify that."