Wolverhampton Wanderers have confirmed that Steven Fletcher has handed in a transfer request.
The striker revealed earlier on Wednesday that he had informed the club of his desire to leave, with Sunderland thought to have had two bids rejected for the Scot.
"Wolves can confirm that Steven Fletcher has handed in an official transfer request," read an official statement.
"The player's frustration stems from the fact that several bids have been rejected for his services, none of which meets the club's valuation.
"As previously stated, no player will leave Wolves unless the club's valuation is met."
Fletcher scored 12 goals last season as the Midlands side were relegated from the Premier League.
