When Jose Mourinho reportedly told Bastien Schweinsteiger to clear out his first-team locker and start training with the reserves earlier this week, he probably didn't think it would cause the outrage that has followed.
After all, the veteran German midfielder was one of the most criticised players during Manchester United's disappointing 2015/16 campaign.
As it turns out, though, a lot of people are unhappy with what has been seen as a huge sign of disrespect shown from Mourinho. Today those complaints reached a new high as Bayern Munich president Karl-Heinz Rummenigge fired a warning to the Old Trafford club.
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In comments made to German publication Bild, and relayed by the Daily Mail, the Bayern chief admitted being shocked by the Schweinsteiger reports, before claiming they could have serious repercussions for United in the months and years ahead.
"'I could hardly believe it," he explained. "One or two players are going to think long and hard in future about whether they want to go to such a club.
"Nothing like that has ever happened at Bayern Munich."
Although Manchester United have been incredibly successful in the transfer market so far this summer - signing Henrikh Mkhitaryan, Eric Bailly, Zlatan Ibrahimovic and preparing for the arrival of Paul Pogba - Rummenigge's warning isn't too ridiculous.
Old Trafford will always be an attractive place for players to play because of United's illustrious history.
However, if potential recruits are watching on and seeing how established World Cup winning stars such as Schweinsteiger are being 'disrespected', they might opt to join another big club who they feel would be more forgiving.
After all, after several disappointing campaigns, United aren't quite the draw they once were, even if they are about to break the world transfer record.
With Rummenigge joining the likes of Schweinsteiger's own brother and a host of United fans on social media in calling into question Mourinho's treatment of the former Bayern star, the new Red Devils boss will be hoping he doesn't come to rue his hard stance on the veteran.