World Cup winning coach Rod Macqueen says the Wallabies must take priority over Super Rugby play-off dreams, even if that means the ACT Brumbies have to sacrifice crucial competition points next month.

Wallabies coach Robbie Deans named a 25-man squad on Sunday in the lead-up to the British and Irish Lions tour in June and July.

It was made up of five Brumbies, 10 Waratahs, seven Queenslanders, two Melbourne Rebels and one Western Force player.

The players are expected to attend a team camp on June 3 and be relieved of Super Rugby duties, meaning the Brumbies contingent miss what looms as a crucial clash against the Melbourne Rebels on June 7.

Captain Ben Mowen, Ben Alexander, Stephen Moore, Christian Lealiifano and Joseph Tomane were all picked.

Pat McCabe and George Smith are injured and David Pocock has already been ruled out for the year.

If McCabe and Smith are unavailable as expected, Brumbies coach Jake White would have just 22 full-time contracted players to pick from as well as the five extended player squad members.

With the race to be the best team in the Australian conference so tight and the Brumbies fighting to break an eight-season play-off drought, the match against the Rebels could be season-defining.

A home final comes with the extra incentive of an injection of up to $500,000 into the club coffers.

The Brumbies know how heartbreaking missing the finals is after losing the last game of last season to fall agonisingly short of a play-off berth.

But even if the club's depth is stretched to breaking point and a finals spot is on the line, Macqueen says the Wallabies take priority.

''I think they should have thought about this a few years earlier but that hasn't been done and I think the priority always has to be with the Australian team,'' Macqueen said.

''They're not ideal circumstances but I think the priority has to be for the Wallabies to be successful against the Lions. That's a fair call.

''It's not an easy situation because it represents money lost to the franchise.''

Results in the coming weeks will determine how the Brumbies are placed to make a charge to the play-offs.

The Lions only tour Australia once every 12 years.

But if the Brumbies are on the cusp of the finals and miss out, they may have to wait even longer to get back into the play-offs for the first time since 2004.