PSG's pattern of angry exits could see the end of Kylian Mbappe and Mauricio Pochettino

One of the referee’s assistants finished his night’s work with a broken flag. The most expensive attacking partnership ever put together by a football club reflected once again on a broken dream.

Neymar and Kylian Mbappe, €400 million worth of Paris Saint-Germain investment, have known too many European Champions League eliminations not to wonder if the near-misses are part of a chronic problem.

Not long after the final whistle had blown on a surreal night at the Bernabeu stadium, where Real Madrid had, in the space of Karim Benzema’s 17-minute, second-half hat-trick erased a 2-0 PSG advantage, the referee Danny Makkiele and his assistants were paid a visit in their dressing-room.

According to the match official’s report, so angry and confrontational was the delegation led by Paris Saint-Germain’s president, Nasser Al Khelaifi, that a linesman’s flag was vandalised, amid hot-tempered insults directed at the refereeing team.

Uefa, organisers of the competition, may impose a sanction, on senior PSG executives and on manager Mauricio Pochettino for his angry remarks about the refereeing of the see-saw second leg of the tie. Pochettino claimed his goalkeeper, Gigio Donnarumma, had been fouled by Benzema in the immediate build-up to the first Madrid goal. “What was VAR doing?” asked Pochettino. “It was a clear foul and that goal changed the game.”

PSG are developing quite a reputation for angry exits. Three seasons ago, at the same stage in the Champions League, Neymar was among those enraged at the award of a penalty, for a perceived handball by PSG’s Presnel Kimpembe late in a tie against Manchester United. Neymar, absent from the pitch with injury, still made noisy enough criticism of the officials that he picked up a