Arsenal next season difficulties （midfielder）

I think Arsenal can become better if Wanger leave....
As for midfielder, I think the best player Carzola will be take into play next season, but it is a qurpestion that whether he will maintain his state...
And what Asrsena need is a good defend midfielder, like Kante or Progba
Aboutely Ramsey or Xhaka did not do their job well, and Arsenal need a strong defend midfielder to oppose the attack from enemy team...