Spain's 21-year-old central midfielder Javi Martinez had to leave his side's FIFA World Cup™ training session early on Thursday after suffering an ankle injury, team sources said.

A Spanish Federation statement revealed that Martinez, a newcomer to the international scene, suffered "a heavy blow to the ankle" shortly before the session ended at team headquarters in Potchefstroom, southwest of Johannesburg.

The Federation said they were monitoring the Athletic Bilbao player's fitness ahead of Saturday's quarter-final with Paraguay in Johannesburg. Another Spanish fitness doubt is Real Madrid centre-back Raul Albiol, who has a right leg injury.