Fulham's fifth and final Deadline Day deal saw Marseille midfielder Andre-Frank Zambo Anguissa join for a fee Sky Sports News understands to be £22.3m.
The 22-year-old has penned a five-year-deal at Craven Cottage, subject to a work permit being granted.
The signing caps off a busy Deadline Day for the Premier League newcomers, having also signed Sergio Rico, Luciano Vietto and Timothy Fosu-Mensah on loan, and Joe Bryan for £6m.
"I am delighted to have signed for Fulham today. This is a new chapter in my career and one I'm really looking forward to," Anguissa told the club's website.
"I hope to bring my qualities to this new project. I like a challenge and I will ensure that I give my very best to my team, the club, and the supporters."
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Anguissa is a Cameroon international, representing his country 11 times since making his debut in March 2017.
He helped Marseille reach the Europa League final last season, while he also made 37 Ligue 1 appearances as the club finished fourth in the table.
I’m thrilled to announce that @FulhamFC has signed André Frank Zambo Anguissa. André’s great data profile, top scouting reports, and his sterling reputation confirm his world class talent. He’s been one of our top targets. We’re excited that he’s joining the club! Come on Fulham! pic.twitter.com/jKkmazTIA8— Tony Khan (@TonyKhan) August 9, 2018
The midfielder was a first-team regular at Marseille in their past two campaigns, having joined the club from Stade de Reims in 2015.
It has been a busy summer for Fulham boss Slavisa Jokanovic, who has made a number of key signings after guiding the club back to the top-flight.
Jean Michael Seri, Aleksandar Mitrovic and Alfie Mawson have all arrived for significant fees, while Andre Schurrle and Calum Chambers have also joined the Cottagers on loan.