Mawson made 65 league appearances for Swansea after joining them from Barnsley for £5m in 2016
Premier League newcomers Fulham have signed defender Alfie Mawson from Swansea on a four-year contract in a deal that could cost up to £20m.
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The 24-year-old featured in all of the Swans' Premier League games last season, earning a call-up to the full England squad.
Barnsley will also receive a payment due to a sell-on clause.
"I'm excited by the project going on here and I can't wait to get going," said Mawson.
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More to follow.
Source: bbc.com