Brain injury charity Headway have criticised Ryan Giggs for claiming Daniel James was being 'streetwise' when he appeared to be knocked out on Sunday night.
The Manchester United winger appeared to be knocked unconscious during Wales' draw with Croatia and was left on the floor for several minutes.
Medical staff rushed on to the pitch to his aid before James returned to his feet and carried on playing, with Giggs claiming afterwards that he was 'acting'.
Headway described the comment as 'shocking' on Monday.
They said: 'If that is the case and James was "acting", it raises serious questions about the player's understanding of the seriousness of concussion.
'Not only has he put his own medical team under intense and unfair scrutiny, but he's also set a dangerous example for the millions watching at home.
'Similarly, we have serious concerns about terms like "streetwise" or that the player was "just using his nous". It is simply not acceptable for teams to use concussion protocols for tactical gain.