It's a problem Indian Super League champions Atletico de Kolkata were not prepared for. Portugal international and ATK marquee player Helder Postiga is set to be out of action for at least a month, following the injury picked up in the inaugural game of ISL 2015 against Chennaiyin FC on 3 October.

The Portuguese hotshot was the star of the match as he got on the scoresheet on two occasions for the away side. Following his second goal in the 70th minute of the match, Postiga fell to the ground awkwardly, and had to be stretchered off.

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According to Times of India journalist Marcus Mergulhao, the striker has returned to Portugal for the treatment.

In a statement this afternoon, the franchisee have mentioned that Postiga will also travel to Atletico Madrid's academy in Madrid for further treatment.

"Our marquee player Helder Postiga, who unfortunately suffered a strain during the first match against Chennaiyin FC while scoring his second goal of the match, is going back to Portugal for further treatment. On behalf of Atletico de Kolkata we have sent his MRI reports for further consultation with specialists at Atletico de Madrid," Alberto Marrero, ATK sports director, said in the statement.

"He will be under observation for three-four weeks where he will recuperate and recover under the watchful eyes of international doctors of repute and Atletico de Madrid support staff at their academy."

The Kolkata side play FC Goa in their second game of the ISL season 2 tomorrow.