Brazilian-Portuguese windsurfer Carolina Borges seems to have disappeared on the day she was due to compete.

The Portuguese delegation has been unable to reach her.

After sending an email this morning saying she wouldn’t be able to compete for “medical reasons”, Borges disappeared without a trace newspaper Público reports.

According to the delegation, Borges trained without restrictions yesterday.

Neither her nor her relatives are reachable by phone and it has been confirmed she is not at the hotel where she had been staying, newspaper Expresso writes.

Borges is married to skipper Mark Mendelblatt who is also competing in the Olympics.

The Portuguese delegation has already decided to cancel Borges’ accreditation. Delegation leader Mário Santos told a press conference in London that the case would be “subject to enquiries”.

London 2012 highlights:

Skippers Francisco Andrade and Bernardo Freitas, two of Portugal best medal hopes, finished 9th in the fourth regatta, making it to 4th place in the 49er class, Lusa news agency reports.

Thai Ratchanok Inthanon defeated Portugal’s Telma Santos in the group play stage with 21-10 and 21-6. Santos later told Lusa that she took “pride” in her performance and stressed the quality of her “intimidating” opponent.

In swimming, Sara Oliveira saw her medal hopes dashed after finishing in 24th place in the 200m butterfly.

(Photograph: Nuno Veiga/Lusa)