"You cannot compare players how the players will do under the guidance of (David) Moyes with those same players under the guidance of Louis van Gaal. Every trainer and coach and manager wants a different style of play and different tactics," he outlines.
"Now we have five number 9s and four number 10s and we don't have wingers to play attacking width, not at the highest level, of Ronaldo or Di Maria or something like that. So I have to play also in another way and you have seen that.
"It's a strategy of Manchester United to buy players who are on the way up and getting better, but I only buy when I think we need to."
For the big stories and the banter follow us on Twitter: @tribalfootball