Torreira. He's a good combative midfielder and had a really good first season at Arsenal. He just needs somebody better than Xhaka alongside him.
Which could be Guendouzi in the long term. He's a bit of a raw talent and needs time to learn his trade, but he's going to be a fine player.
We just need to be patient at Arsenal, we've got some great young players coming through. Torreira, Guendouzi, Nelson, Smith Rowe, Willock, Saka. We've also got Holding and Bellerin coming back from injury this season. If we can add a CB and CM, then we're in decent shape.