[5] At West Perth, Allen played as an inside midfielder, a centre-half forward, a centre half-back and a ruckman.

[4] He played for his state as co-captain[6] in the 2017 AFL Under 18 Championships and won the Larke Medal as the best player in the first division after kicking 11 goals over four games.

[4] He played as a centre half-forward, but was named in the Under 18 All-Australian side as a full-forward, confusing WA coach Peter Sumich.

[2] He was compared to former St Kilda captain Nick Riewoldt by his West Perth coach Bill Monaghan,[7] and to Essendon forward Jake Stringer.

Allen singled out his smother on Giant Matt de Boer and watching Nic Naitanui take a flying mark as highlights.