Very hard to say for sure, but signs are that Rooney could turn into a huge problem with trying to get a system that works fluidly, LVG, Mourinho and in the England squad all failed to adjust to find his best position, so far no idea but looks like Koeman hasn't a clue about where he is best playing either, maybe because he has declined a large amount, IF he doesn't manage to find the fountain of youth soon, could be a massive problem with us this season.
Deffo a head scratcher for Koeman. Could see Rooney working playing behind a front 2, but if we get Sigurdsson where does he play, and it still doesn't solve the Klassen problem, too many similar players to accommodate.