Concussion experts have heavily criticised Morocco's decision to let Nordin Amrabat play against Portugal on Wednesday, only five days after he sustained a concussion in their match against Iran.

The North African side lost 1-0, despite outplaying the European champions, and now have no chance of progressing to the knockout stage.

The 31-year-old Amrabat, who spent last season with Spanish side Leganes on loan from Watford, started the game wearing a scrum cap but took it off after 15 minutes.

The fact he was playing at all was a surprise as the Moroccan FA had said after the Iran game that he would need at least a week off, as the 'return to play' protocol for concussions requires.

When asked by reporters after the match why Amrabat played, Renard said: "He's a warrior - he wanted to play.

"He put protection on but he took it off. It's because his spirit is amazing and I'm lucky to have a player like him.

"I'm not a doctor - medical reports are read by competent people, I'm not responsible for medical matters.

"I think he showed that he played an outstanding match. I can't tell you anymore."

While it is true that Amrabat was among Morocco's best performers in the Group B clash at the Luzhniki Stadium, the world footballers' union FIFPro was far from impressed.

In a statement released to Press Association Sport, FIFPro said: "This is yet another alarming example of a player being put in harm's way. Amrabat returned to action too soon according to medical guidelines.

"Four years on from the debacle of the last World Cup, where several players did not receive adequate care, football has not made sufficient progress in concussion management. Repeated calls to implement world-class safety standards have been overlooked."

British brain injury charity Headway agreed with the union's player-welfare concerns, saying it was a breach of FIFA's own guidelines on how to treat concussions.

Headway chief executive Peter McCabe said: "On the face of it this appears to be a scant disregard for FIFA's concussion protocols.

"The decision to allow this player to take to the field not only put his short and long-term health and career at risk but it also set an appalling example for the millions of fans and players around the world.

"FIFA must act - and act decisively - in order to send a clear message that breaches of this vital safety protocol will not be tolerated."

McCabe also pointed out that wearing head gear gives a "false impression" of safety and should not be encouraged