Dele Alli has been sent off for a wild tackle on Brecht Dejaegere in the first half of Tottenham's Europa League last-32 second leg against Gent.
With the score at 1-1 and his team trailing by a goal on aggregate, the England midfielder lunged for a loose ball but instead connected with his opponent's knee.
While the challenge did not look to be premeditated, Alli had moments earlier been complaining of a foul by another Gent player before getting back to his feet.
Spurs took the lead through Christian Eriksen before a Harry Kane own goal brought Gent back level in the Thursday night match at Wembley.
Mauricio Pochettino's men were facing an uphill struggle as a result after a 1-0 defeat in the first leg in Belgium, with the away goal meaning Spurs would need to score at least two to progress.