The Gunners had been long-term admirers of the 24-year-old but the Midlands club outmuscled them to agree a £40million deal. But just how good is the Argentine? Sportsmail takes a look.
Recent reports have seen Aston Villa linked with a move for Manchester City defender Nathan Ake, with the Dutchman set to be allowed to depart the Etihad this summer. While the suggestion is that...
Here is Sportsmail's daily live blog for all the latest transfer news and rumours with a number of high-profile players set to be on the move this summer.