The club captain was stretchered off in the 87th minute after colliding with Chelsea striker Stephen Sarfo.
He remains a doubt for the team's trip to Mauritania to face FC Nouadhibou in the preliminary round qualifier of the 2020/21 CAF Champions League.
Annan had produced some quality saves before the injury and Kotoko were leading 1-0 thanks to Kwame Poku's 18th-minute goal.
He will undergo tests on Monday to ascertain the severity of the injury. Read Full Story
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