Switzerland footballer Michel Morganella has been sent home from the Olympics after posting a racist message on Twitter, team officials confirmed on Monday.

Morganella had directed an offensive Tweet at South Korea's players after Switzerland's 2-1 defeat to the Asian giants on Sunday.

"Michel Morganella has discriminated against, insulted and violated the dignity of the South Korean football team, as well as the South Korean people," said Switzerland Olympic team chef de mission Gian Gilli.

"While the committee felt that Michel had been provoked on his Twitter account and that he has publicly apologised, the Swiss Olympic Committee and Swiss Football Association condemn Morganella's actions to the fullest."