Luca Connell has penned a three-year deal with Barnsley.
The youngster confirmed his Celtic exit earlier this week with an online address after three seasons at the club.
He failed to make a top team appearance for the Parkhead side but spent two successful stints out on loan at Queen's Park.
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He helped the Spiders land back-to-back promotions with the most recent success taking Owen Coyle's men into the Scottish Championship.
Connell will officially join his new club on July 1.
Speaking to Barnsley's official website, he said: "I’m over the moon to finally get it done.
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“Over the years there’s been some speculation about it happening, but I’m finally here and I’m happy to be a Barnsley player.
“My agent is from Barnsley, so he’s told me about the history of the club. He brought Hourihane and [Kieran] Tripper to the club, so there’s high standards.
"I just know that we need to bounce back to get this club back where it belongs.”
Barnsley FC Chief Executive Officer, Khaled El-Ahmad added: “We are pleased that Luca has chosen Barnsley to continue his promising career and are looking forward to seeing his development in a Reds shirt.”
