Newcastle United are reluctant to lose Aleksandar Mitrovic next month.
The Daily Star says Swansea are the latest club to show an interest in the Serbian striker with West Ham and Crystal Palace also on his trail.
Swans boss Bob Bradley is weighing up a £15m bid for a player the club came close to signing in July last year before he moved to the Magpies.
The struggling Swans are desperate for goals having scored just 11 since the arrival of Bradley at the start of October.
But despite being willing to splash the cash on Mitrovic to help save them from relegation, Newcastle insist he is not for sale.