The Gunners activated Partey’s £45 million release clause on deadline day to bring Arteta’s top priority target in from Atletico Madrid.
The 27-year-old enjoyed five years in Atletico’s first team, getting to the Champions League semi-finals in 2015-16 and coming third in La Liga last season.
With just Granit Xhaka, Mohamed Elneny and loanee Dani Ceballos the only other central midfielders in the squad, the Ghana international was a much-needed acquisition.
When asked why he was so keen on Partey, Arteta told the club’s official website: ‘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.
‘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 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.’