British police are probing possible assault charges against tennis player David Nalbandian after his kick at an on-court advertising board during the final of the Aegon Championships at the Queen's Club in London resulted in injuries to a line judge, the BBC said Monday.

Nalbandian was disqualified from the tourney after winning the first set of the final 7-6(3) but fell behind in the second 4-3 - at which point he exploded when Croatia's Mari Cilic broke his serve and kicked the board under the chair where line judge Andrew McDougall was seated.

McDougall's leg was bleeding from the 30-year-old tennis player's onslaught.

Organizers of the Aegon tournament announced that the Argentine must forfeit the 36,500-pound ($57,350) prize reserved for Queens finalists, while the ATP fined him the maximum 10,000 euros ($12,566) for unsportslike conduct.

Nalbandian, currently ranked 39th in the world, apologized on court and subsequently issued a statement expressing regret over the incident.

"I never intended to hit him (the line judge), it was an unfortunate reaction in which I wanted to let off steam after losing a point," the Argentine said. "I had the opportunity to personally apologize to the line umpire for this regrettable act that I am fully responsible for." EFE