Collingwood coach Mick Malthouse has strongly backed the current AFL finals system, saying to change it would be a mistake.

The AFL is looking at enlarging the finals structure next year when the competition expands to 18 teams.

But the three-time premiership coach says the finals must remain elite.

The AFL could expand the final eight to nine or even 10 teams and also lengthen the final series from four weeks to five.

The league will decide on the format of next year's fixture in June.

Malthouse has also backed the current pre-season format, saying it serves many useful purposes as teams prepare for premiership matches.

The AFL could also scrap the current four week pre-season format when they decide on next year's fixture.

Collingwood and Essendon will attract a capacity crowd on Friday night when they meet in the pre-season final at Etihad Stadium.

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