Riley Hardeman, Kallan Dawson and Finnbar Maley have joined North Melbourne's extended squad ahead of Sunday's clash with the Adelaide Crows at the Adelaide Oval, with no confirmed outs so far.

Griffin Logue remains unavailable as he continues to recover from a minor hamstring strain, while fellow defender Jackson Archer is still suspended and won't be a chance to return until Round 5 selection.

Hardeman, Dawson and Maley are on the extended interchange bench for Sunday's game along with Darcy Tucker, Dylan Stephens, Jacob Konstanty, Toby Pink and Will Phillips. The bench will be reduced to five players when the Roos announce their team at 5pm AEDT on Friday.

One interchange player will be named substitute when the final line-up is confirmed an hour before Sunday's 3.20pm AEDT bounce.

The Roos will be hoping to build on their commanding 59-point win over Melbourne in Round 2, but face a tough challenge against the undefeated Crows, who have dispatched St Kilda and Essendon so far.