Beiranvand collided with his own player when attempting to deal with a dangerous cross from the right wing, leaving him flat on the turf while sporting a bloodied face.
After several minutes of medical attention, the Iranian No.1 decided that he was fit to continue – despite concussion protocol dictating that serious blows to the head should result in immediate withdrawal – with it only after going down again a few minutes later that he was finally replaced.
Beiranvand received treatment on the pitch for about 10 minutes before trying to play on during Iran’s opening group match against England.
The 30-year-old was eventually taken off on a stretcher and replaced.
“I don’t see how him carrying on is right. I think it’s a joke,” said Jenas on BBC One’s World Cup coverage.
“It’s 2022 and we are having so many discussions about concussion protocols. That’s why these protocols are in place. This is not OK.”
Beiranvand received medical treatment after clashing heads with his own defender in the penalty box, before appearing to tell Iran’s medical team he wanted to play on.
However, he looked visibly dazed and had a bloodied nose, and eventually signalled that he needed to come off.
“Beiranvand shouldn’t be on the pitch now. It’s almost as if he’s been forced to carry on here,” said Jenas.
“It’s just really unacceptable. It doesn’t matter how important Beiranvand is to [Iran manager] Carlos Queiroz.”
England defender Harry Maguire was quickly taken off after being assessed for concussion in the second half when the Three Lions were 4-1 up.
Gareth Southgate and his players fumed after the referee failed to award the spot kick despite Maguire appearing to be bear-hugged in the box.
The incident prompted a protest from Southgate, who waved his arms in frustration.
Maguire proved to be a danger in the box and almost gave England the lead in the 30th minute with a header from a Kieran Trippier corner that came back off the bar.
Moments later Jude Bellingham showed him how it was down when he headed in Luke Shaw’s pinpoint cross.
It was the 19-year-old’s first goal for the Three Lions in his 18th appearance.
Bukayo Saka and Raheem Sterling then quickly added more goals in a superb first half for England.
Beiranvand went down in agony after incidentally being headbutt by his team-mate following an England cross – with medical staff running to his aid.
After a lengthy check, in which he looked weak on his feet and a team-mate splashed water on his face, a clearly groggy Beiranvand changed his shirt and attempted to continue despite huge worry from supporters.
Agreeing on the broadcast, BBC Sport pundit Jermaine Jenas said: “If Beiranvand has to miss 10 days for his health and his safety, then so be it. That’s why these protocols are in place.
“I don’t see how him carrying on is right. This is ridiculous. It’s almost as if he’s been forced to carry on here.
One fan wrote on Twitter: “Brave effort, but it shows football is still a long way behind other sports in terms of head injury assessments.”
A second agreed: “These incidents could come back to haunt football.”
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