Carlton have reinforced their vow to rebuild the club via youthful elite talent by signing a trio of their most promising teenagers, along with powerful 20-year-old Charlie Curnow.

Heading into their bye, the Blues on Friday re-signed first-round draft picks Curnow, Harry McKay and Sam Petrevski-Seton, along with budding 18-year-old midfielder Zac Fisher.

Sam Petrevski-Seton: One of four young Carlton players to re-sign with the club. Credit:AFL Media/Getty Images

While forward Levi Casboult has indicated he will test himself in the free agency market at the end of the season, 19-year-old Petrevski-Seton on Friday committed to the club with a revised four-year contract that ties him to Carlton until the end of 2021.

Fellow West Australian Fisher has extended his agreement, signing a new two-year deal that takes him until the end of 2020, with 19-year-old key forward hope McKay, now in his second season, committing for a further two years until the end of 2019.