Video footage captured Juventus star Pablo Dybala and some of his teammates openly laughing at Ronald Koeman during their 3-0 victory over Barcelona in the Champions League.
Both teams had already secured qualification for the knockout stages ahead of Tuesday night's game, but Koeman was in desperate need of a win following his side's humiliating La Liga defeat to minnows Cadiz at the weekend.
His side were totally outclassed, however, with two Cristiano Ronaldo penalties and a Weston McKennie goal ensuring it was a comfortable night for the Serie A giants at the Nou Camp.
And the pressure certainly seems to be getting to Koeman judging by the fireworks off the pitch between him and the Juventus bench after their second penalty was awarded.
It is believed that Dybala, along with a number of the other substitutes, vocally demanded that the referee should have sent off Barca defender Clement Lenglet for the handball which led to the spot-kick.
Koeman angrily turned to them and told them to "shut up", but this appeared to have little effect.
On the contrary, it only seemed to amuse Dybala and co, who laughed together and gestured towards Koeman in a jovial manner.
The former Everton and Netherlands manager cut a frustrated figure on the sidelines, and the spotlight will be turned on him once again when his side host Levante in La Liga this weekend.
After ten games of the season played Barcelona are languishing down in ninth place, and are already 12 points behind leaders Atletico Madrid and six behind bitter rivals Real Madrid.
And there are already rumours of a dressing room revolt and speculation that Koeman has begun to lose control at a club which appear in total disarray, with midfielder Philippe Coutinho recently admitting there is "a lot of tension" within the team.
