Partey sealed his move to the English Premier League side before the transfer deadline.
This was after the Gunners invoked an automatic transfer by paying the full buyout clause of £45m from Spanish side Atletico Madrid.
The 27-year-old has signed a five-year contract to end months of speculation over the move.
Partey underwent a successful medical examination in Madrid on Monday before putting pen to paper on deal until 2025, and will pocket £250,000 as weekly wages.
Osei, popularly known as Palmer, took to Twitter to celebrate Partey's move to the Emirate Stadium by posting: 'Congratulations @Thomaspartey22 !! Great addition to the Arsenal set up. I wish you well.'
Read Full StoryCongratulations @Thomaspartey22!! Great addition to the Arsenal set up. I wish you well. pic.twitter.com/bv7R7BopBN
— Wilfred Kwaku Osei Palmer (@oseipalmerP4P) October 5, 2020

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