The 24-year-old has had numerous spells at different clubs while at the City Ground, playing for Milton Keynes Dons, Northampton Town and Motherwell.
Ariyibi spent the second half of last season on loan at the Scottish club, scoring just two goals as he made 17 appearances.
The American’s first taste of English football came at Southampton, where he made two appearances for the under-23 side back in the 2012-2013 season.
Fans responded sarcastically to the news that he had left the club as they took to Twitter.
Here is a selection of tweets from the City Ground faithful:
Club Legend, thank you for everything
— Joshua Mann (@_JoshuaMann) September 1, 2019
Thanks lads, weekend ruined.
— GrapsTalk (@GrapsTalk) September 1, 2019
Great signing will be missed
— Charlie (@Charlie3003_) September 1, 2019
Cheers, son’s crying, nice one
— Craig Radford (@craigradford) September 1, 2019
Going to miss him, played a huge part last year
— Rl91 (@RobertoL91) September 1, 2019
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God only knows how we’re going to replace him
— Simoon Ⓥ (@WaldramSimon) September 1, 2019