Central defender Alfie Mawson moved from Swansea to Fulham.
Fulham acquired the central defender Alfi Mawson from Swansea, the official website of "summer residents".
The 24-year-old Englishman signed the contract until 2022, and the transfer amount, according to Sky Sports, was 20 million pounds.
Mawson is a graduate of Brentford, and in Swansea moved in the summer of 2016 from Barnsley for five million pounds.
Last season he was in the starting line-up in all 38 Premier League games for the "swans" who failed to keep a residence permit in the top flight.
Earlier this summer Fulham's line-up was joined by goalkeeper Fabry, central defender Maxim Le Marchant, midfielder Jean Mikael Seri, winger Andre Schurrle and striker Alexander Mitrovic.