The highlight, though, came in November when Ole Gunnar Solskjaer named Mengi in the first-team squad for the Europa League group stage trip to FC Astana.
In both cases, Mengi and Manchester United are rushing back to stop Everton from mounting a successful counter-attack.
Academy product Mengi, who made his senior debut in last season's Europa League against LASK Linz, is set to stay at the club until at least 2024, with an option for an additional 12 months in his contract.