Barnsley have made Georgie Gent their fifth summer signing.
The 20-year-old left-back signs from Blackburn Rovers for an undisclosed fee on a three-year deal, with a club option for another year.
The former Manchester City academy player moved to Blackburn in 2019 and never made his debut.
He spent last season on loan at Motherwell, making 31 appearances with two goals and five assists.
Barnsley have been looking at a left wing-back all summer with Callum Styles the only other senior player who has featured there regularly.
Gent told the club website: “I'm over the moon to join a massive football club like Barnsley. I can't wait to meet my teammates and meet the fans."
Sporting director Mladen Sormaz said: “We watched Georgie at Motherwell a lot last season and we feel he is a top prospect for the future who also has the maturity to step straight in an make an impact this year.
"We first entered into discussions with Blackburn in May, but they wanted to take him away for pre-season and assess him, so we started to work on other deals. “However, we ultimately made the decision to hold out for Georgie as our top target in that position.
"So far this summer we have tried to bring in exciting young talent alongside some experienced pros and we are confident that this blend is going to give us an identity that the fans can be proud of.”