Adelaide have declared key trio Bernie Vince, Jason Porplyzia and Brett Burton fit to play Richmond in Sunday's battle of the AFL's winless.

All three failed to train fully earlier this week, but proved their fitness on Friday, Crows coach Neil Craig said.

Their availability results in Craig, for the first time this season, naming an unchanged side for Sunday's AAMI Stadium fixture against the Tigers.

"We haven't got a huge amount of selection pressure ... but I'm still comfortable to go with that," Craig said.

One-gamer Tony Armstrong will be kept from SANFL action and act as emergency for the Sunday twilight match.

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