Ghana superstar, Thomas Partey will wear jersey number 18 at Arsenal.
Arsenal signed Thomas Partey from Atletico Madrid on Monday night after activating the player’s £45 million transfer release clause.
On Monday the Premier League club finally agreed to pay the £45 million fee and the 27-year-old and his medical took place in the Spanish capital.
The midfielder completed his move to the Emirates stadium just minutes before the transfer deadline and move from the La Liga side after Arsenal invoked an automatic transfer by paying the full buyout clause of £60m.
The Black Stars first vice-captain made 46 appearances for Atletico last season, playing a key role in their third-place finish in La Liga and reaching the quarter-finals of the Champions League.
The 27-year-old midfielder had been with Atletico since 2012, making 188 appearances, in which time he won both the Europa League and Super Cup in 2018, and was a Champions League runner-up in 2016.
During his career, Thomas has also enjoyed successful loan spells in Spain with RCD Mallorca (2013/14) and UD Almeria (2014/15), and has made 29 international appearances for Ghana.
