I'm sure Ruben Amorim is intelligent enough to realise he can’t just copy and paste what he did at Sporting Lisbon in order to create immediate success at Manchester United.
To ask a squad which lacks athleticism and confidence to replicate his preferred 3-4-3 with high energy and flying wing backs carries big risks in the Premier League.
The best managers adapt to personnel. Pep Guardiola’s Manchester City tweaked things when Erling Haaland arrived. Jurgen Klopp opted for three midfield runners only after Philippe Coutinho had left.