The 19-year-old has joined the Latics on a season-long loan.
Miyaichi joined the Gunners in 2010 and has since spent time on loan at Feyenoord and Bolton.
The youngster impressed while on loan at Bolton last season.
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The start of the 2017-18 Premier League season is just around the corner and is shaping up to be one of the most competitive yet.
As always it is the so called “big clubs” that have splashed the most cash in the transfer window so far this summer. Manchester United or City? Arsenal or Tottenham? Who are the winners and losers of the transfer window so far?