It's only 2 players so far and 1 of them is from the Premier League. Don't think there will be such a big of the players adapting to their new teammates but if anything, they might just take some time to adapt to Van Gaal's style. That being said, he just said recently with the Dutch team that he doesn't care about the style, only bothers with the win. They do actually, at least on paper. They won't face any of last season's Top 7 till mid-October, where they will face Everton at Old Trafford. Before that, United will play Swansea(H), Sunderland(A), Burnley(A), QPR(H), Leicester(A) and West Ham(H). Their hell-ish run of games will come in March-April as they'll face Spurs, Liverpool, Man City, us and Everton in consecutive games with the only easy game against Villa throw into that run.