Spain centre-back Gerard Pique was forced to leave training early on Monday after hurting his left knee just four days ahead of the team's opening Group B game against Portugal.

The Barcelona defender appeared to have pulled his knee while practicing in Spain's headquarters for the 2018 FIFA World Cup in Russia — Krasnodar soccer city, according to reports in Efe.

The 31-year-old looked to carry on for a while and tested his discomfort by kicking the ball around but he left the pitch after a while.

The former Manchester United man is not enjoying a good time overall it seems as he was on the receiving end of a robbery few days back.

It was reported that his house has been reportedly robbed after police in Spain's northeastern Catalonia region opened an investigation into a burglary case last Wednesday.

The suspects allegedly took advantage of the stormy weather to enter the house undetected while the parents of the Spain international soccer player, who were house-sitting the property in Esplugues de Llobregat, a well-heeled, leafy neighbourhood that is home to several soccer players, were asleep, sources close to the investigation told Efe news agency.

Pique and Shakira were both in the German city of Cologne at the time, where the Colombian-Lebanese singer was to performing in a concert.

The suspected thieves caused no personal damage and the Catalan regional police were considering it a case of non-violent robbery, the sources added.

Manchester City's attacking midfielder David Silva also left the training ground early, although he showed no obvious signs of discomfort.

Spain looks to repeat its success at the 2010 World Cup in South Africa but will have to overcome Portugal, Iran and Morocco first to make it through the group stages.

Spain's 23-man final squad :

David de Gea, Pepe Reina, Kepa Arrizabalaga; Dani Carvajal, Alvaro Odriozola, Gerard Pique, Sergio Ramos, Nacho, Cesar Azpilicueta, Jordi Alba, Nacho Monreal; Sergio Busquets, Saul Niquez, Koke, Thiago Alcantara, Andres Iniesta, David Silva; Isco, Marcio Asensio, Lucas Vazquez, Iago Aspas, Rodrigo, Diego Costa.