The Porcupine Warriors won the encounter thanks to goals from Andy Kumi and Godfred Asiamah.
Kumi was the first to score when he finished off a brilliant move in the 26th minute. The attacker's second goal in successive games.
Kotoko had to wait until the 90th minute to double their lead through Asiamah.
It's coach Mariano Barretto second win in charge of Kotoko. The Portuguese is yet to concede a goal, having won his first game 4-0 against Bechem United last Wednesday.
Kotoko sits top of the league and a point above second-placed Great Olympics while Chelsea are 12th. Read Full Story
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