The versatile defender spent last season with Crystal Palace but went into pre-season hoping to convince Jose Mourinho to keep him in Manchester this season.
Fulham's American owner Shahid Khan - who has tabled a £600million pound bid to buy Wembley Stadium - sanctioned spending big with the likes of highly-rated Ivory Coast midfielder Jean-Michael Seri as the London club return to the Premier League after a four year hiatus.
The Netherlands global, who has made 21 senior appearances for United since his debut under Louis van Gaal in 2016, played 24 games for Palace last season.
Roy Hodgson was rewarded a one-year extension to his present contract for retaining Crystal Palace's Premier League status.
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24-year-old Sevilla academy graduate Rico has made 170 appearances for the Spanish side during his career, and has also been capped once by the national team.
Fulham goalkeeper Fabri is set to win the race to start the season as Slavisa Jokanovic's No 1. I'm very excited to get started with the team tomorrow.
And it has been claimed that he is closing in on linking up with Fulham on season-long loan deal as he looks to play more senior football this summer.
He did manage a hat trick against Las Palmas in the Copa del Rey in January, and now will be seeking more consistent form as he moves to London.