Jan Vertonghen did not suffer a concussion in Tottenham's Champions League defeat to Ajax, Spurs have confirmed, but the centre-back is a doubt for the return leg in Amsterdam on Wednesday.
Vertonghen required extensive treatment after colliding with the back of fellow Belgium defender and Spurs team-mate Toby Alderweireld's head in the first half of Tuesday's 1-0 loss to his former club in London.
Despite initially being cleared to return to action, Vertonghen had to be withdrawn moments later and he needed to be helped from the pitch in worrying scenes, with brain injury charity Headway saying that the incident showed the need for "temporary concussion substitutions".