Tottenham defender Jan Vertonghen was due at the club’s training ground on Wednesday afternoon for further assessments following his sickening head injury in the Champions League semi-final with Ajax.
Vertonghen left the pitch during the 1-0 first-leg defeat in worrying fashion after a collision with team-mate Toby Alderweireld left him with a bloodied face and unable to walk unaided.
He was initially given the all-clear to return to pitch after lengthy treatment, but it was short-lived as he retched on the touchline and had to be helped into the dressing room.
Spurs later confirmed that he had not suffered a concussion, that all protocols to allow him back on to the pitch were correctly followed and the 32-year-old walked away from the stadium freely after the game.
Concussion protocols require further assessments, which Press Association Sport understands Vertonghen will undergo on Wednesday, but Spurs hope to have him available for the second leg in Amsterdam next week.
However, Vertonghen’s unsuccessful attempt to play on, where he assured referee Antonio Mateu Lahoz he was well enough to continue, has led to brain injury charity Headway calling for the introduction of “temporary concussion substitutions”.
The charity insists rolling substitutes would allow medical staff to make proper assessments of injured players without pressure of the match situation.
Luke Griggs, spokesperson for Headway, said in a statement released to Press Association Sport: “We believe the time has come for football to introduce temporary concussion substitutions that would allow for longer off-pitch assessments to be conducted.
“Concussion is notoriously difficult to diagnose. The symptoms may be hidden and require the individual to be honest about how they’re feeling, while they can also be delayed in their presentation.
“Assessing a player for three minutes – or even five, as was the case with Jan Vertonghen – does not allow for medical staff to make a reliable diagnosis, particularly when this is conducted on the pitch under the gaze of tens of thousands of fans eager for the game to resume.
“The pressure on club medical staff is enormous and unfair, particularly in such high-stakes games such as a Champions League semi-final.”
Griggs also believes that the assessment and decision on whether a player can continue should be made by an independent doctor.
“In addition, independent doctors with expertise in concussion and head injuries should make the ultimate decision as to whether or not a player is fit to continue,” he added.
“Not every head injury will result in a concussion. But allowing players to continue while showing clear signs of discomfort following a head injury is contrary to the ‘if in doubt, sit it out’ principle at the heart of all effective concussion protocols.”
Tottenham boss Mauricio Pochettino insisted he played no part in the decision to allow his defender to play on.
The Argentinian said: “I wasn’t involved. I wasn’t involved. It was the doctor’s decision.
“I think it’s so important, the rules and the protocol are there and our medical staff follow the protocol.
“I was never involved. The decision was the doctor and the referee asked.”
Tottenham were criticised in November 2013 after goalkeeper Hugo Lloris was allowed to remain on the pitch against Everton after being knocked out in a collision with Romelu Lukaku’s knee and initially being unable to remember where he was.