CHONGQING, China (AFP) - Japan's chief delegate on Thursday said he was considering filing a protest against China over "dangerous acts" during their East Asian championships clash here.

Goalkeeper Zong Lei injured Japan's Michihiro Yasuda with a flying kick, while defender Li Weifeng grabbed winger Keita Suzuki by the throat during the hosts' ill-tempered 1-0 defeat.

Playmaker Yasuhito Endo also received a kick to the thigh which left him writhing on the floor.

"We deplore yesterday's performances very much. As the delegation, we are considering making some representations to the EAFF (East Asian Football Federation)," Kuniya Daini told reporters.

"Dangerous acts could threaten players' careers."

Daini also hit out at North Korean referee Song O-Tae, who handed out four yellow cards to the hosts but did not send anyone off.

He said he would consult with Japanese men's coach Takeshi Okada later Thursday and may take action on Friday.

"We may seek appropriate steps to be taken with regard to both rough plays and refereeing," Daini said.

Okada had already complained he was "very much dissatisfied" with the officiating and other matters.

"I told my players to act calmly but it was myself who was more excited," he said after the match.

South Korea earlier voiced regret to the Asian Football Confederation over Chinese women's captain Li Jie's behaviour during the hosts' 3-2 win on Monday.

Li collapsed on the pitch in apparent time-wasting tactics as South Korea prepared to take a corner deep into stoppage time.

She was taken off the field but hurried back to obstruct the corner, which was never taken as Thai referee Kamnueng Pannipar blew for full time. Li received a second yellow card for her antics.

Japan's complaints came after Chinese fans booed the visitors loudly during their opening game against North Korea.

The crowd was more restrained during Wednesday's match but aimed abuse and plastic bottles at their own team as the game ended.