A 2-1 victory in the Battle of Britain tie lifted United into fourth place in the table and means a point next week should be enough to clinch a top-eight finish.
Garnacho has been linked with a move away from United this month after struggling to fit into Amroim's system, with both Napoli and Chelsea interested in the 20-year-old.
Bruno Fernandes' winning goal will steal all the headlines, but Manchester United's Altay Bayindir was the unsung hero against Rangers.
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