The Belgium international collided with Spurs team-mate Alderweireld and Ajax goalkeeper Onana during the teams’ Champions League semi-final in April 2019.
“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.”
“I still had a year left on my contract, so I had to play, but when I played, I played badly,” added Vertonghen.
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