The 23-year-old has now scored more goals playing in a top-flight which dates back to his days at Ghana Premier League side WAFA SC.
The Ghana international striker found the back of the net in the 83rd minute to give the visitors the assurance goal.
He had come on to replace Husein Balic on 58 minutes.
Tetteh has now scored seven league goals in 25 appearances this term.
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