Belgium will not take part in the triathlon mixed relay event at the Paris Olympics on Monday after one of their athletes, Claire Michel, fell ill, the Belgian Olympic Committee (COIB) said on Sunday.

"Claire Michel, a member of the relay, is unfortunately ill and must withdraw from the competition," the COIB said in a statement.

"The COIB and Belgian Triathlon hope that lessons will be learned for future triathlon competitions at the Olympic Games. We are thinking here of the guarantee of training days, competition days and the competition format, which must be clarified in advance to ensure that there is no uncertainty for athletes, entourage and supporters."

Training sessions for the swimming leg of the triathlon have been canceled due to water quality in the River Seine. The men's event was delayed to last Wednesday, and took place on the same day as the women's.

Organizers said on Sunday they were confident Monday's relay would take place despite canceling Sunday's training.