In a column for the Daily Mail, he said: "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. Initially, if Amorim demands this set of United players be progressive with the press and play a higher line, it would invite trouble.
"The central defenders don’t have the pace to compensate for a lack of numbers in midfield, particularly when Leny Yoro is injured. In Portugal, Sporting have the best players so it makes sense to be braver with philosophy and formation. United are a different case. Against better teams, they lack legs at this level."