Asamoah Gyan's availability for Ghana's World Cup qualifier against Zambia on Friday remains a major concern for Black Stars coach Kwesi Appiah.The striker is racing against time to be fit for the fitness ahead of the final second round qualifier at the Baba Yara Stadium.Gyan limped off during the team's training session on Tuesday at the Accra Sports Stadium, coming just after goalkeeper Adam Kwarasey was withdrawn from the Black Stars squad due to injury.Appiah is not prepared to take any risk with Gyan, explaining that he needs to put forward a strong team against the Chipolopolos.“We cannot not risk Gyan or take chances by fielding a weak team,” said Appiah, who will monitor Gyan's condition to enable him make a quick decision.“He is our captain and a very good player for us but if he is not fit, we don’t take that risk in such a situation. We know Ghanaians will want to see him on Friday, but seriously, we will cannot take such chances.”Ghana need only to avoid defeat against the Chipolopolo at the Baba Yara Stadium to secure a place in the play-off round for World Cup qualifying.