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San Sebastiano club's attacker Darko Kovacevic will not play for four months after undergoing Achilles tendon surgery - announced the Spanish club on Saturday.
The former national team player of Serbia and Montenegro scored four goals this season and was the top scorer of the team.
Real Sociedad experienced a similar situation last season, when Darko Kovacevic's teammate and partner in attack, Nihat, missed the second half of the season due to a serious knee injury.
The Basque club is currently in 10th position in the Spanish league, having accumulated 16 points in 11 played matches.