Imminent Manchester United departee Scott McTominay reportedly had a furious bust-up with a teammate last season.
United have agreed a deal in principle to sell the Scotland international to Serie A side Napoli for around £25 million.
McTominay had been heavily linked with Fulham earlier in the window, with United rejecting their bid.
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The midfielder now looks to to move to Italy if he agrees personal terms and passes a medical.
McTominay scored 10 times in all competitions for United last season, including seven in the Premier League.
But he was also said to have been involved in a dressing room bust-up after one game.
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United were well beaten by Brighton at Old Trafford, with Danny Welbeck, Pascal Gross and Joao Pedro all scoring in a 3-1 victory which handed United their worst-ever start to a season.
The Sun claimed that Lisandro Martinez and Victor Lindelof "lost it" with one another after the dismal defensive display.
However, the report also stated that United captain Bruno Fernandes confronted McTominay, who made his first start of the new season as the Red Devils suffered a third loss in four games.
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McTominay has been associated with United since the age of five and made his debut in 2017, going on to make 254 more appearances.
His exit is likely to allow United to bring in top defensive midfield target Manuel Ugarte from Paris Saint-Germain.
But former United defender Rio Ferdinand is furious with the decision to sell the academy graduate, feeling as though he useful coming off the bench.
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Speaking on his Rio Presents podcast, Ferdinand said: "I always say this, to win the league you need the likes of a John O'Shea, a Wes Brown, Darren Fletcher, Chicharito, Ole Gunnar Solskjaer from when we were at United.
"Or you need the likes of [Julian] Alvarez when he was at City who can come in, like last season Jeremy Doku was coming in and impacting games even though not necessarily always starting all the games.
"Those players are huge, you need those players and they understand the DNA especially the ones who come through the academy, Man United have always stood by that.
"It really doesn't sit well with me, to replace him you are going to have to spend, 30, 40, £50m and it's not going to be cheap to replace him. "
Topics: Scott Mctominay, Manchester United, Bruno Fernandes, Napoli