Richmond are expected to pull a selection shock this afternoon and pick richly-talented WA teenager Sydney Stack to make his AFL debut against Greater Western Sydney on Saturday.

The West Australian understands Stack will be in the Tigers’ team when it is announced later this afternoon.

It continues a remarkable six months for Stack, who overlooked in the national and rookie drafts in November, despite WA under-18 coach Peter Sumich labelling him the most talented local in the draft pool.

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But Stack received an invite to train with Richmond over summer and spent some time living with coach Damien Hardwick before he was officially added to the list as a rookie in February through the pre-season supplemental selection period.

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It is understood Stack has been training down back in his time at Richmond and is likely to fill a spot in defence against the Giants.

It comes after injuries to Alex Rance and Bachar Houli, as well as the suspension of Dylan Grimes.

Camera Icon Sydney Stack is set to make his AFL debut. Credit: AAPIMAGE

The former Perth midfielder is renowned for his toughness and skill and balance with the ball in hand.

Stack would become the third player from last year’s crop to debut after Geelong’s Jordan Clark and mature age Saint Matthew Parker.