Manchester United players are angry with Louis van Gaal's treatment of Rafael, who was overlooked for much of last season before being sold to Lyon this summer.
This is according to the Telegraph, who understand many players at Old Trafford felt Van Gaal showed a complete lack of respect towards a popular member of the squad.
Rafael joined Manchester United in 2008 and had been a firm fixture under Sir Alex Ferguson and, to a lesser extent, David Moyes - but failed to convince Van Gaal of his quality and subsequently lost his first-team place to Antonio Valencia.
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The Brazilian made 11 appearances for United in all competitions last season, with the turning point appearing to come in the Red Devils' 5-3 defeat to Leicester City last September.
Rafael conceded the penalty that led to Leicester's second goal and Manchester United's subsequent capitulation.
United fans wanted Rafael to stay as back-up
Van Gaal stuck with Rafael in his squad for the remainder of the 2014-15 campaign, but sold him last month for just £2.5 million.
Many Manchester United fans expressed their disappointment with the decision on social media - the 25-year-old, as well as being a popular figure in the Old Trafford dressing room, was a fan favourite - despite the signing of Matteo Darmian from Torino.
The majority of supporters would have preferred to see Rafael stay at Old Trafford to provide back-up for Darmian, rather than Antonio Valencia, who is not a full-back by trade.
But it seems once Van Gaal loses faith or trust in a player, that's it - game over.
He is prepared to make unpopular decisions if he believes it's in the best interests of Manchester United - and he did just that with Rafael this summer.
Manchester United fans: was Louis van Gaal right to sell Rafael? Have your say by leaving a comment in the box below!