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Shortly after they announced Porto left-back Alex Telles had joined for a reported £13 million, the club confirmed the Uruguayan striker had become their third signing of the summer.
United had been hellbent on signing Jadon Sancho from Borussia Dortmund but after refusing to pay the asking price set, it's Cavani who takes the vacant No.7 shirt.
The former Napoli man had been out of contract after recently being released by PSG following the 2019/20 Ligue One campaign.
Benfica and Atletico Madrid had both been linked but Cavani has made the move to Old Trafford on a two-year deal after signing a contract and completing a medical before the transfer window shut on deadline day.
"Manchester United is one of the greatest clubs in the world, so it is a real honour to be here," he told the official Manchester United website.
"I've worked really hard during the time off and I feel eager to compete and represent this incredible club.
"I have played in front of some of the most passionate supporters in football during my career and I know that it will be the same in Manchester. I cannot wait to experience the Old Trafford atmosphere, when it is safe for the fans to return.
"I look forward to continuing to write my little story inside the book of football and I know that's why my focus has to remain the same as always - work, work, work. I have had a conversation with the manager and this has increased my desire to wear this beautiful shirt."
Said to be one of the top earners for the 13-time Premier League winners, Cavani gives United another option up top alongside the likes of Anthony Martial, Odion Ighalo and Marcus Rashford and will be hoping to have the same level of impact as his ex teammate Zlatan Ibrahimovic,.
The Swede scored 17 goals in his first 28 appearances in the Premier League for the Red Devils after joining on a free following his contract in the French capital not being extended back in 2016.
Cavani has scored 353 goals in 586 games in his career and is PSG's all-time top scorer, with 200 strikes for Les Bleus.
However, he found himself displaced by Mauro Icardi last term and only scored seven times in all competitions.
The experienced striker has not played a game of football for around seven months and has instead being keeping up his fitness by practicing ballet dancing at the National Ballet of Uruguay.
"I don't share the view that every boy has to play only soccer," he explained.
"I believe that girls and boys have to be free to seek their happiness in what they are most passionate about, because that's the best way to be well-trained, growing day by day in a firm structure."
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