Arsenal has a really looong list to send from the team this summer as it seems...

Honestly nearly all of them are really useless for the squad. Trossard can actually be useful as a substitute after revolutionizing the team. He can bring critical points to his team sometimes with his nice individual skills. 

This is a good way to raise funds by the way. They spent a lot of money earlier on some solid players such as Rice and so on. Now they should make sure there won't be any issues with FFP too while spending a huge amount on a new striker probably.