Trossard is the only name I will strike out of the list if he will agree to be a substitute, the rest can all be sold. It's supposed to be a busy summer for Arsenal because aside from the fact that they have a lot of players to sell, they also need to buy a lot of players.
Selling all those players won't be easy, but they can make it work. Why selling is so important is that it will create space and finance to buy the players they need. They need a striker, a left winger, a central creative midfielder and a full back. These players need to be very good, and they will most likely be expensive. If they had those players for this season, together with the current squad they have, they might not have been knocked out by Newcastle, and they will stand a better chance of winning Madrid.