Manchester United stars reportedly clashed in the dressing room during the half-time break in the Manchester derby, before manager Jose Mourinho calmed matters down.
According to The Sun, some of United's stars apparently had a go at each other after a dismal first-half display at Old Trafford.
Mourinho is said to have let the players express themselves for a couple of minutes before calming them down and setting the tone for the second half.
"The hairdryer came out for the first time this season, but it had nothing to do with Jose," a United source apparently told the English publication.
"The players could be heard shouting and arguing amongst themselves during the interval. Jose decided to let them blow off steam for a couple of minutes.
"He then quietened the whole situation down and told them they also needed to calm down or the second half could be much worse.
"Goodness knows what it would have been like if Zlatan wasn't handed that gift."
United went 1-0 down just 15 minutes into the game after Kevin De Bruyne opened the scoring. Things went from bad to worse for Mourinho's side when Kelechi Iheanacho netted the second for City in the 36th minute.
Zlatan Ibrahimovic found a consolation goal just before half-time, but United failed to make a much better second half count, and lost their first game under the Portuguese tactician.
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