Nicklas Bendtner will be fined by Arsenal after the club opened an internal investigation into bizarre allegations about his conduct on a night out in Copenhagen.

Danish tabloid BT claims the 26-year-old centre forward threatened a taxi driver while his team-mates were getting knocked out of the Champions League by Bayern Munich on Tuesday night.

During the incident, it is alleged that Bendtner unbuttoned his trousers, rubbed himself against the side of the cab and whipped the vehicle with his belt.

And speaking ahead of Arsenal's derby clash against Tottenham on Sunday, manager Arsene Wenger hinted the troubled striker had played his last game for the club and would be fined.

'Honestly I don't know really what happened because I haven't spoken to him,' said Wenger.

'The only thing that is for sure is he had nothing to do in Copenhagen. Nobody gave him any permission to go to Copenhagen and he will be fined for that.

'For the rest, he has created some trouble there I don't know, I will speak to him today.'

Bendtner has not played for the Gunners since February 2, but did start for Denmark in the Wembley friendly against England last week. Asked whether this was the 'final straw' for the player, Wenger said: 'He is at the end of his contract at the end of the season.'

The taxi driver was quoted in BT as saying: ‘I’ve seen drunks and alcoholics in Copenhagen for over 25 years, but I’ve never experienced anything like it.’

Bendtner did not travel to Germany due to a suspected knee injury. Arsenal will fine him heavily if he is guilty of wrongdoing.