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Tottenham Hotspur fans have slammed the club for letting Jan Vertonghen try to play on after sustaining a head injury in the Champions League semi-final first leg against Ajax.

The Belgium defender was involved in a clash of heads with team-mate Toby Alderweireld in the first half.

He was tended to by Spurs' medical team, with blood pouring from his wound, which appeared to be just below his eye.

Mauricio Pochettino and his medical team refused to substitute the 32-year-old, however, and he was allowed to return to the field of play.

Despite that, he asked to be substituted just a couple of minutes later, with Vertonghen clearly dazed from the clash with his compatriot.

Spurs lost 1-0, with Donny van de Beek scoring the only goal of the game.

And supporters took to Twitter to express their disgust at the club's concussion protocol.

Indeed, many believe that he should have been substituted immediately, particularly with his face left a crimson mask.

Take a look at the best of the reaction below!