Brisbane have extended the contracts of four youngsters yet to debut at AFL level, including 2021 first-round pick Darcy Wilmot.

Henry Smith and Kalin Lane, the latter having joined the Lions in last year's mid-season draft, have extended their time at Brisbane until at least the end of 2024, while Wilmot and fellow 2021 draftee Jimmy Tunstill added an additional two years to their contracts - committing until the end of 2025.

Lane and Smith are ruckmen over 205cm tall, and have impressed this year with Brisbane short on ruckmen behind Oscar McInerney and Darcy Fort.

Tunstill's play as a midfielder at VFL level has impressed, while Wilmot, featuring at VFL level at half-back, has been promising without the reward of a senior appearance - including last weekend's 23 disposal, four mark performance.

The signing spree will allow the Lions' list managers to focus upon the looming free agency of Daniel McStay, who is a restricted free agent at the end of this season and has already attracted interest from Victorian clubs.

McStay was injured in Brisbane's Round 8 defeat of West Coast, and will look to return to the line-up in Round 11 when the Lions host GWS.

Dayne Zorko, Mitch Robinson and Ryan Lester are unrestricted free agents.