Li Yongbo, the head coach of China's badminton national team, said the Badminton World Federation was careless when it ousted players for match-throwing at the London Olympics.

China's Yu Yang and Wang Xiaoli, the women's doubles world No 1 pair, were disqualified along with another six female players on charges of "not using one's best efforts to win a match".

"It's too careless. I can't understand why they didn't let them play," Li said in an interview with China Central Television on Sunday.