Koroman has been capped 24 times by his country
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Portsmouth's battle to avoid relegation has been dealt another blow after Ognjen Koroman damaged a hamstring in Saturday's 2-0 loss at Chelsea.
The Serbian winger, 27, on loan from Russian side Terek Grozny, was replaced after 68 minutes of his Pompey debut.
Portsmouth boss Harry Redknapp said: "He tweaked a hamstring and we took him off hoping it would not be too late to save him doing more damage."
Pompey have picked up one point from their last seven Premiership games.