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Striker Fernando Torres, who suffered a thigh muscle injury, may miss the city derby with Everton on October 17.
Playing only 9 minutes in the Premier League match against Blackpool, the footballer was substituted and did not join the Spanish national team camp preparing for the European Championship qualification matches against Lithuania and Scotland.
It is estimated that Torres will be unable to play for about two weeks, but there is still hope of seeing him in the match against Everton.