Who says it's mind games? This guy knows that they are going to struggle this upcoming season just as you and I knows, he is not blind to the fact that Manchester united are playing when compared to other top teams. By looking at other top teams how they are very active in the transfer in strengthening their teams, you will wonder why Manchester united aren't doing the same considering how terrible they perform last season and how they finished, so Amorin knows what he is saying, he is not sugar-coating anything here, he is just say it as it is.
You might call it a mind game if the league is already underway, not now that they are haven't even started.
ruben has seen that with what manchester united has now and compared it to what manchester city, liverpool, arsenal, or chelsea are doing, it's still lacking, so he sees that this will be a season that makes them 'suffer' and it's not a mind game, but really an outpouring of his heart. and i don't see that it's a big mistake for a manager to say such pessimistic things, because sometimes painful facts need to be said, so that when manchester united's performance doesn't match what was expected, the supporters won't be surprised anymore, because ruben himself has said that from the start.