The 18-year-old was introduced in the 55th minute to replace Benjamin Bockie.
Two minutes later, Liefering conceded and were now behind after taking a 29th-minute lead through Benjamin Sesko.
That goal was cancelled out three minutes into the second half when Haris Tabakovi? converted a spot-kick.
Amankwaah stepped up and with an assist from Luka Su?i?, he found the back of the net in the 73rd minute.
It was his second goal in nine appearances for the side he joined in February.
Sesko scored a three-minute brace to give the visitors a deserved win. Read Full Story
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