 But there was a warning from concussion charity Headway who are campaigning for temporary substitutes and insist football is not dealing with the issue. Liverpool's James Milner also went off with a head injury in their Champions League tie with Napoli while Aston Villa keeper Emiliano Martinez suffered a blow to the head last weekend. Son - who was pictured after the game with swelling to his face - may well have not been concussed and there is no suggestion any of the club medics are not following rules but Headway say football's lawmakers need to change guidelines on head injurie){kind=link}
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Son Heung-min will undergo surgery after his head injury which puts a major doubt over his fitness for the World Cup.
Tottenham striker Son suffered a fracture near his left eye during their Champions League win in Marseille on Tuesday night.
South Korea star Son will face a race against time after the operation which will be done to “stabilise” the injury but the club are not putting a time scale on the recovery and stress it will depend on rehabilitation.
The Tottenham statement said: “We can confirm that Heung-Min Son will undergo surgery to stabilise a fracture around his left eye.