West Coast's No.1 AFL draft pick Chris Masten was fined $750 in court on Monday for disorderly behaviour on Australia Day.

The East Fremantle recruit was caught up in trouble during Australia Day celebrations in Perth, with police handcuffing the 18-year-old, issuing him with a "move-on" order and taking him to the South Perth mobile police compound.

The Eagles hierarchy and leadership group swiftly fined Masten $2,000 and suspended him from any involvement in this year's AFL pre-season competition.

Today, the matter was dealt with in the Perth Magistrates Court where Masten's lawyer John Prior said his client was pleading guilty to disorderly behaviour in public.

Masten did not appear because he was at training.

Mr Prior said Masten has already been "punished" by his club, including the fine and being unable to play in the NAB cup.

Magistrate Peter Malone gave him a spent conviction, which means Masten won't always have to declare it to others, and fined $750.

Masten was picked up at No.3 in last year's AFL national draft as part of the deal for trading premiership captain Chris Judd to Carlton.

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