This is the moment that a Celtic fan was wrestled to the ground by German police over a Palestine flag.

Footage, widely shared online, has emerged of a Hoops fan embroiled in a heated encounter with the force in Dortmund last night.

Brendan Rodgers' side were thumped 7-1 on matchday two of this season's Champions League in what was another humiliating result for the Northern Irishman in Europe.

Daizen Maeda did give the 5,000-strong travelling Hoops support something to cheer after nine minutes, as the Japanese forward equalised after Emre Can's early spot kick. 

However, last season's runners-up were on top of their game as they put another six past the Scottish Premiership champions to romp home to victory.

Numerous Palestine flags were on display in the away end at Westfalenstadion.

However, this Celtic fan was caught up in a flashpoint with cops on the stairwell during the game.

It's not clear if the German police took issue with the flag itself, or the slogan on it, which read: "From the River to the Sea."

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Meanwhile, former Celtic and Borussia Dortmund great Paul Lambert has shared his thoughts on what went wrong for the Parkhead side in Germany.

Reflecting on the match on talkSPORT on Wednesday morning, Lambert said: “I never said it yesterday, but that’s exactly what can happen in that stadium. You’ve got to be a big, big player there to handle that atmosphere. If you don’t handle that, that’s exactly what can happen.

“And I think there’s going to be criticism coming Celtic’s way, but I think you’ve got to put it into perspective."