Jose Mourinho reportedly had a heated training ground bust-up with Manchester United fitness coach Carlos Lalin.
The Red Devils face Rostov tonight in their Round of 16 second leg clash.
And according to The Sun, tempers were high ahead of the big game.
They say Mourinho and fitness specialist Lalin had to be separated before yesterday’s training session.
The pair stood head to head and were screaming at each other at United’s Carrington base.
The Sun add that scout Ricardo Formosinho had to step in and separate Mourinho and Lalin to make sure it didn’t escalate any further.
Lalin headed to his car and sped away from the training ground following the spat.