Hearts of Oak are sweating on the fitness of talisman Winful Cobbinah for Sunday's Ghana Premier League derby in Kumasi.

The talented midfielder was replaced in the 82nd minute as the Phobians beat Berekum Chelsea 2-0 at Accra Sports Stadium on Wednesday afternoon.

Hearts of Oak's Twitter handle reported the Ghana international had suffered a muscle problem.

He is replaced by Robert Addo eight minutes away from full-time.

78' Cobbinah has picked up a muscle problem. He's being seen off the pitch. @paulacquah42 is getting readied. #AHOSC 2-0

— Accra Hearts Of Oak (@HeartsOfOakGH) July 12, 2017