Former Tottenham defender Jan Vertonghen says he felt the effects of a concussion he sustained playing for Spurs for the following nine months.
The 33-year-old Belgium international collided with Spurs team-mate Toby Alderweireld and Ajax goalkeeper Andre Onana during the teams' Champions League semi-final in April 2019.
He tried to play on before he was led off and appeared to vomit.
"I suffered a lot from that - dizziness and headaches," said Vertonghen.
"I should not have continued playing, it affected me in total for nine months and that's why I couldn't bring what I wanted to on the field.