BRISBANE father-son prospect Jaspa Fletcher will face a delayed start to his pre-season after suffering a back stress reaction. 

Fletcher, who could attract a top-15 bid on draft night, is tied to the Lions as both an Academy player and father-son, with his dad Adrian having played 107 of his 231 AFL games for the club.

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He also played for Geelong, St Kilda and Fremantle, but Jaspa is only eligible to join the Lions and could be a first-round pick for the club later this month.

Fletcher had back soreness recently which has been diagnosed as a stress injury that will see him sidelined for the start of the pre-season and in a back brace for the next period. 

Clubs were made aware of the injury on Thursday via the AFL's medicos. 

The classy midfielder had a foot injury earlier in the season but has impressed with his skilful ball use and impressive performances for the Allies at the mid-year championships.

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Fletcher played for the Lions Academy this season and is set to join Brisbane alongside fellow father-son Will Ashcroft, with the club loading up on draft points to ensure it can match bids for the pair.

Don't miss AFL.com.au's huge line-up of draft coverage. NAB AFL Draft Night Countdown is back from Thursday, November 24 with four massive shows in the lead-up to the main event, featuring interviews with draft prospects, coaches, recruiters, list managers and player agents.

Then on November 28-29, catch AFL.com.au's comprehensive coverage of the draft with NAB AFL Draft Night Live with all the picks, expert analysis and highlights.