By NBF News

The TV reporter girlfriend of Spain goalkeeper Iker Casillas demanded he explain a blunder which lost them their match against Switzerland, live on TV.

The stunned shot-stopper walked off when his girlfriend asked him after the game: “How did you muck that up?”

Spanish fans have reacted angrily saying reporter Sara Carbonero, once voted the world's sexiest journalist, distracted him during the game.

In their opening game of the tournament Switzerland beat Spain 1-0.

After the post-match interview, Spanish football websites erupted in indignation, blaming 25-year-old Carbonero for “sapping his strength”.

The wives and girlfriends of Spanish players, known as esposas y novias, are barred from accompanying them to the tournament.

Iker Casillas and Sara Carbonero in happier times
Before the World Cup, when it was announced Carbonero would be in South Africa doing her trademark post-match interviews, she dismissed claims she would be disruptive, saying: “Can I destabilise the team? I think it's nonsense”.

Swiss midfielder Gelson Fernandes bundled the ball into Spain's goal in the 52rd minute of the game.

Casillas had rushed out to tackle an incoming Swiss forward, but failed to grab the ball, which fell luckily for Fernandes.

“I don't know what to say,” said Casillas in the post-match interview.

“I don't know if this defeat will have consequences. The dressing room is fed-up.”

Carbonero, who was voted Sexiest Reporter in the World by FHM USA last year, has been dating the Real Madrid goalkeeper since 2009.

Before their opening match, Spain were rated as co-favourites to win the tournament alongside Brazil.