Neymar and Gianluigi Donnarumma clashed in a dressing room bust-up after Paris Saint-Germain's 3-1 Champions League defeat to Real Madrid on Wednesday, sources have confirmed to ESPN.

The Brazil forward and Italy goalkeeper had to be separated by teammates after a heated post-match exchange at the Bernabeu, with each blaming the other for PSG's round-of-16 exit.

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Kylian Mbappe opened the scoring in the first half -- putting PSG in a dominant position, 2-0 up in the tie -- before a dramatic 17-minute hat trick from Karim Benzema saw Madrid progress to the quarter-finals 3-2 on aggregate.

The loss sparked a furious reaction from the French club in the immediate aftermath of the match, with president Nasser Al-Khelaifi and sporting director Leonardo seeking to confront the referee over what they called the "shameful" decision not to rule out Benzema's first goal.

Sources told ESPN that in a separate incident, Neymar and Donnarumma squared up to each other in the dressing room, with the Brazil forward criticising the goalkeeper for his error ahead of Benzema's 61st minute equaliser.

Donnarumma allowed himself to be closed down by Benzema and then as he tried to clear the ball, passed it across goal to Vinicius Junior, who pulled it back for Benzema to make it 1-1.

The keeper responded by pointing out that Neymar had conceded possession ahead of Madrid's second, giving the ball away to Luka Modric, who drove forwards to begin the move that ended with Benzema levelling the tie in the 76th minute.

PSG coach Mauricio Pochettino described the incident which led to Madrid's first goal as "a clear foul."

"It's unbelievable," he said. "It's impossible to accept. Overall we were the better team. It's so disappointing.

"The emotion of the game changed. You give Real Madrid belief, and at the Bernabeu of course, it's difficult to manage the situation. The team was so affected. It's so unfair. It changed the way the game went completely."