Manchester United have signed Swedish defender Victor Lindelof from Benfica on a four-year deal.
The 22-year-old arrived at Manchester United's Aon Training Complex on Wednesday morning after the two clubs agreed a reported fee of €35 million (£30.75m).
United boss Jose Mourinho told the club's official website: "Victor is a very talented young player, who has a great future ahead of him at United.
"Our season last year showed us that we need options and quality to add depth to the squad and Victor is the first to join us this summer.
"I know that our fantastic group of players will welcome him as one of us.''
Join us in saying #HejVictor.
- Manchester United (@ManUtd) June 14, 2017
Lindelof had arrived in Manchester fresh from international duty with Sweden, where he was an unused substitute in Tuesday night's 1-1 draw with Norway.
Lindelof has been a long-time target for United as they look to bolster their defensive options ahead of next season's return to the Champions League.
He told United's official website: "I am thrilled to be joining Manchester United.
"I have enjoyed my time at Benfica enormously and I have learned a lot there. But I'm looking forward to playing in the Premier League at Old Trafford and for Jose Mourinho.
"I'm keen to get started and make my contribution to the team's efforts to win more trophies.''
Lindelof could be one of three or four high-profile acquisitions at Old Trafford this summer, with the club also understood to be keen on Alvaro Morata.
The Real Madrid forward's agent said earlier this week that United had lodged a "very important offer'' with the Spanish giants to try to bring him to the north west of England.
In defence, Mourinho now boasts an impressive array of options with Lindelof joining the likes of Eric Bailly, Marcos Rojo, Chris Smalling, Phil Jones and Daley Blind.
But Lindelof, who started his career with lowly Swedish club Vasteras before moving to Benfica in 2011, said he is willing to fight for his starting place.
In an interview with MUTV, Lindelof said: "Of course there are some great players here in my position.
"I'm here to do my best to try to help the team as much as I can and it's always good to have other good players around you. When you have that, you get better as well.
"I think every move means you have to adapt to a new environment but I feel comfortable in myself. I trust myself and it's going to be tough but I'm looking forward to it.
"I always had a dream of coming here to play in the Premier League so, for me, it's a dream come true.''
He added: "United is one of the biggest clubs in the world and they always want to win titles, so that is also my goal. I want to come here and win titles. That is the goal of the club and the players as well. I think for everyone who is joining this club, it is changing [their life]."
Lindelof said he is looking forward to working under Mourinho and to getting preseason under way.
"I've spoken to him, it was a good chat," he said. "It's very important for me too, to hear what he has to say, so it was good. Of course, he's a great coach and for me to be able to work with him is a great opportunity for me.
"It's going to be very important for me to get the whole preseason, to get to know the system here and all my teammates. It's going to be very important."
Lindelof said he is also excited about playing at Old Trafford for the first time and to do well for United fans back in his native Sweden.
"I think it's going to be a great feeling," he said. "I've seen a lot of games on TV but I've never been at the stadium so I think it's going to be a great feeling.
"It's a very big club back home. They have a lot of supporters in Sweden. When you speak about the biggest clubs in the world, you always speak about Manchester. It's a great club and a great organisation."
And despite the addition of Lindelof, Jones says he is not threatened by the defender's arrival at Old Trafford.
Jones had another injury-disrupted season, despite starting the last four games of the Premier League campaign, and his first-team prospects next term are already facing a squeeze.
"We're Manchester United, we're going to attract the best players and the biggest players. It would be a strange summer if we weren't signing players like that,'' said Jones.
"Competition is always good. I've spoken to the manager, he just asks how you're feeling, how you're doing, just a normal conversation between player and manager.
"He's a good man manager, he's like that with all the players.''