"It is not about one man. It is a good team and we have to give our best. ATK is the best team so far in this tournament," Kostas told reporters.
It would be for the first time that Kostas would be playing in an astro turf ground at the Salt Lake stadium here.
"It's not easy to play. I will give my best," the Greece star said.
His teammate Dudu Omagbemi, who also plays for East Bengal, said he is a professional footballer and is not thinking about the old club but about his new team.