Vickers, 20, joins the Tykes on a season-long loan.
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"Caylan is a player I've admired for some time. He's direct, intelligent, on the ball, and brings a real spark in the final third," Barnsley boss Conor Hourihane said.
"We're looking to add youthful energy and creativity to our attack this season and Caylan fits that profile perfectly.
"I'm looking forward to working with him and helping him take the next step in his development."