The midfielder impressed last season during a loan spell with Brentford and the 20 year old is believed now to be earmarked for a place in the senior side.
Swansea boss Kenny Jacket said,
"I enquired about Pratley but that one is a no go at the moment"
The defensive midfielder has also impressed Martin Allen but he is believed to have also been warned off the player after these latest reports.
Swansea will have the oppertunity to go up against Pratley's Fulham side in a friendly in July and may try and persuade Fulham into accepting their offer.