Manchester United have completed the signing of Tyrell Malacia for £12.9m rising to £14.6m on a four-year contract with the option of an additional year.
The Netherlands international, 22, will cost 15m (£13m) euros with a further 2m (£1.7m) euros in add-ons.
Malacia, who made 136 appearances for Feyenoord, is the first new arrival of Erik ten Hag’s tenure as United manager following his move from Ajax.
The Netherlands international arrives from Feyenoord and will immediately provide competition to incumbent starter Luke Shaw.
The 22-year-old appeared set to join Lyon, before United stepped in and made a decisive bid.
“It’s an incredible feeling to have joined,” he said.
Malacia added: “This is a new chapter for me, a new league with new team-mates and a tremendous manager leading us.
“I know from playing against his teams in the Eredivisie, the qualities that he has and what he demands of his players.
“While I know that I am still young and will continue to develop, I can promise the United fans that I will leave everything on the pitch every time I pull on the red shirt.”
The left-sided defender had been in talks with French club Lyon before United stepped in.
It had been hoped the deal for Malacia would be done on Monday but it was delayed waiting for a work permit.
It is anticipated he will now be part of the United squad that leaves for its pre-season trip to Thailand and Australia on Friday afternoon.
John Murtough, United’s football director, said: “Tyrell is an exciting, dynamic young footballer with excellent experience for his age, including five seasons in the Eredivisie, a European final and full International honours for the Netherlands.
“We look forward to seeing him continue to develop under the guidance of Erik ten Hag and his coaching team in the years ahead.”
Midfield remains the top priority for Ten Hag, and Barcelona star Frenkie de Jong is his preferred option to reinforce that area.
Free agent Christian Eriksen has verbally agreed a three-year contract with the Red Devils after his successful six-month spell at Brentford.
Ten Hag is keen to add at least five new faces to his squad over the summer, with Ajax duo Antony and Lisandro Martinez firmly on his radar.
A new back-up goalkeeper is also being sought to replace the departing Dean Henderson.