The former Berekum Chelsea forward scored on the stroke of half time when his side was trailing by two goals to reduce the deficit before the break.
Vladislav Malkevich equalized for the host five minutes into the second half to make it 2-2 before Nikolay Yanush restored the visitors lead after 60 seconds to make it 3-2 to Isloch.
17 minutes from full time, Yanush scored the fourth for the away side to break the host heart as they inflicted a 4-2 loss on Mozyr.
Tetteh in all competitions this season has scored once with one assist in 12 games.
The 25-year-old forward's current market value is €150,000.