The game at Rangers' training ground was halted after a fight during which China's Zheng Tao was knocked out and suffered two cracks in his jaw.

QPR chairman Gianni Paladini has hinted that he could sack some of the players involved in the fight.

"When we find out what went wrong, I will come down very strong," he said.

A spokesman for the Metropolitan Police told BBC Radio Five Live: "No arrests have been made, but inquiries are continuing into the incident."

The Football Association has confirmed it is also investigating the brawl, which is said to have included up to 30 people.

Whether the local guys (QPR) or our guys began it is not important. It is unacceptable

China coach Ratomir Dujkovic

Paladini added: "We will conduct our own internal investigation into this matter. We will go to work 24 hours a day to find out what happened.

"If people cannot control themselves they should not be there, in that position, because sooner or later something like that is going to happen again.

"Therefore, it depends how much provocation was in it, and when we find out what went wrong, myself and [manager] John Gregory will act.

"I am sick about the whole thing, completely fed up. I hope we can find something out by Saturday."

Meanwhile, China coach Ratomir Dujkovic admitted he missed the origins of the incident, but added: "Whether the local guys (QPR) or our guys began it is not important. It is unacceptable."

However, team manager Li Xiaoguang insists he will take full responsibility for the incident.

"I would like to make an official apology," he said. "Whatever the reasons for the incident, as the team manager, I will take the responsibility.

"We have noticed some of the young players can not control themselves well. But, although the participants in this incident were the players, I will take all the blame.

"The unexpected incident happened in any case and I will be conducting a serious inquiry into it. We have learnt a lesson from this incident."

Premiership official Dermot Gallagher was refereeing the match but was forced to bring an early end to proceedings after the fight broke out.

An FA spokesman said: "We are investigating and we will be seeking information from Dermot Gallagher."

The unusual circumstances of the game - it was not an official match and took place at QPR's training ground - means it could be difficult for the FA to act.

The China squad are in England for two weeks, based at Chelsea's training complex at Cobham, Surrey, as they prepare for next year's Olympic Games in Beijing.

They are scheduled to play Brentford on 16 February.