Fabio Jalo has signed a new contract with Barnsley until 2027, with the club having an option to add an extra year.
The Portugal under 19s international striker, who has played 23 first team games, was already contracted until 2025.
He has been a star player in the academy, after joining age 14, and has three cup goals for the first team.
Several top flight clubs in this country and others have been interested with a bid turned down last summer by Italian outfit Lecce.
Acting director of football Bobby Hassell told the club website: “Securing the long-term future of Fábio at Barnsley was a move we were keen to act swiftly on due to the obvious talent he possesses and the potential we see in him at the club.
“The progress that Fábio has made is testament to his hard work and the management from the staff at Oakwell to ensure his development is at the forefront of our thinking – an integral part of the long-term strategy implemented when he first joined us as a young boy.
“Praise must go to the academy staff at the Club also who aided Fáb’s development, including Tom Harban, overseeing his progression from 18s and 21s to the first team, and Tiago Rodrigues, who has upheld a good relationship with Fábio’s family and helped convey our ideas more effectively as an interpreter.
“We felt that Barnsley was the best place for Fábio to continue his development and fulfil his potential and provide a platform to showcase his talents with the guidance of the established support network Fábio has had around him for the last four years.
“We’d like to thank Fábio’s family for trusting us with his development for a further three-and-a-half years and we are excited to continue the good work with Fáb going forward.”