Mikel Arteta had wanted Thomas Partey for some time - and is delighted to have finally got his man.
But what is it about the Ghana international that made him his primary transfer target?
"We identified him a few months ago and we have been following his progress, and obviously the more you know about the squad, you know more about where you think you can improve it," Arteta told Arsenal.com.
"We believe he has the right qualities, with his character and his personality and as well with his technical qualities and positional options that he can give to the team.
"I think he allows us to play different formations and he can fit in within those formations in different positions, which is a really good thing to have in a squad where, in midfield, I think we were a little bit short.
"I have a few things in mind that I want to start to train with the team and [Partey's signing] is going to give us a little bit more adaptability and more balance in defending and attacking transitions and the way we have to set up certain structures to attack better in certain moments of the game."
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