Police investigate assault allegation made against Nalbandian

(CNN) -- David Nalbandian is under police investigation for an alleged assault after a line judge was injured when the Argentine tennis star kicked over an advertising board in Sunday's Queen's Club final.

London's Metropolitan Police confirmed to CNN Monday that a complaint had been received following the incident, which led to Nalbandian's disqualification, with Croatian Marin Cilic awarded the title.

"We are aware of an incident which took place at the Aegon Championships on June 17," said a police spokesman.

"A complaint of assault has been made and the Metropolitan Police Service is now investigating."

Nalbandian was a set up, but trailing in the second when his frustrations boiled over after failing to return a Cilic service.

David Nalbandian shows his concern after line judge Andrew McDougall is left with a gashed leg.

Line judge McDougall remonstrates with Nalbandian after the Argentina star's ill-judged kick left him with a gashed leg.

Nalbandian learns his fate from ATP official Tom Barnes as he is disqualified for 'unsporting behavior'

The Queen's Club final had started well for Nalbandian after he took the opening set against Marin Cilic.

Croatia's Marin Cilic was left to claim the winning trophy at Queen's Club after Nalbandian was disqualified.

Injured official

Angry confrontation

Automatic disqualification

Early advantage

Cilic triumph

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Nalbandian disqualified in Queen's final after angry kick leaves official injured

He lashed out at a court side advertising board, behind which line judge Andrew McDougall was sitting.

The force of the kick dislodged the display, which hit McDougall and left him a nasty gash to his left leg.

McDougall was seen to angrily remonstrate with Nalbandian, who was defaulted for "unsportsmanlike conduct."

ATP supervisor Tom Barnes confirmed that he had been left with no other choice, much to the disappointment of a capacity crowd who had been enjoying a closely contested final.

"Once I saw the injury it was not a judgment call. I didn't have any other option," he told the official ATP Tour website.

Nalbandian forfeited the $56,802 prize money and the 150 ranking points he would have received and later Monday was fined $12,564 by the ATP for his actions.

Nalbandian, who was defaulted for insulting a linesman at tournament in Chile in 2002, said he regretted the latest incident.

"I made a mistake and I apologize," the 30-year-old told the official ATP Tour website.

"I feel very sorry to the guy. I didn't want to do that. This is a bad situation for everybody that I really apologize for."

The official tournament website said McDougall had been tended to by St John's Ambulance and ATP medical staff but did not need any further treatment.