Tarryn Thomas showed why he looks set to be an early selection for North Melbourne at next year's NAB AFL Draft with a standout performance in an under-18 trial game for the Allies on the weekend.

Thomas, who is an indigenous prospect from Tasmania, is aligned to the Roos through their Next Generation Academy zone.

He is not eligible to be drafted until 2018 but has already shone at under-18 level and looks likely to be the first top-end pick under the NGA rules, which were established last year.

North will have priority access on Thomas, who last year was named Tasmania's MVP at under-16 and under-18 national level, but will have to acquire him through the same bidding process as father-son and northern academy prospects.

Thomas had 17 disposals and kicked a goal for the Allies against Vic Metro's trial team on Sunday, with the squad of NSW-ACT, Queensland, Northern Territory and Tasmanian players coming together for the first time ahead of June's NAB AFL Under-18 Championships.

His skills and pace caught the eye in the gloomy weather at Ikon Park in Melbourne, with the Allies splitting their squad into two groups for matches against Vic Country and Vic Metro sides.

Thomas played in the stronger outfit that beat the Metro side by 36 points, with Connor Ballenden (15 disposals, 19 hit-outs, six inside-50s) impressing with his work around the ground and fellow Brisbane Lions academy member Jack Clayton having 16 touches.

Vic Metro 6.1 (37)
Allies 11.7 (73)

BEST

Vic Metro: Jones, Petruccelle, Coffield, North, Landt, Stoddart
Allies: Thomas, Bell, Dixon, Myers, Ballenden, Clayton

GOALS

Vic Metro: Jones 2, Penrith, Petruccelle, Harman, Grace
Allies: Bell 2, Crossley 2, Hardman 2, Dixon, Thomas, Clayton, Powell, Fitzgerald