Swansea director John van Zweden has revealed that four Premier League clubs, including Manchester United and Chelsea, have made enquiries for Michel Vorm.
The Dutch international goalkeeper has emerged as a real star this season and has been one of the best shot-stoppers in England.
Vorm's performances have seen him linked to other clubs, and now van Zweden - who is a director and co-owner of the club - has confirmed that United, Chelsea, Tottenham and Newcastle have all made approaches.
"Clubs have enquired about Vorm," he told VI Radio.
"Manchester United have asked, in addition Chelsea and for that matter Newcastle United. Tottenham Hotspur have cautiously announced they are interested.
"It would be a nightmare for us if he left."
Swansea signed Vorm for just over £1million last summer from FC Utrecht and the Dutch club admit they would be happy to see him move on as they have a sell-on clause.
"I'm not mentioning sums, but it is more than training costs," Utrecht technical director Foeke Booy confirmed.