Barbarians coach Jamie Joseph expects Christian Lealiifano to remind Australia what they're missing against Samoa.
The Brumbies back missed out on selection for the Rugby World Cup squad despite being a key member of the Wallabies squad over the last few years.
Lealiifano will start for the Barbarians at fly-half in the first ever rugby game at the Olympic Stadium in London this Saturday.
Backing him to put in a strong performance, Joseph said that Lealiifano was hungry to make an impression.
"Christian is a quality player, I think the Wallabies are well aware of his abilities too,' Joseph told the Press Association.
"But it never hurts to show what you can do in the international arena.
"You never know when injuries can strike either, so whilst he hasn't been selected initially, stranger things have happened than him being drafted back in. So I'm sure he knows just how important it will be to have a strong game, and I know that he will be ready.
"I don't think it will be preying on anyone's mind – but a good performance wouldn't hurt, that's for sure. World Cup squads are very difficult to balance, I haven't really put a lot of thought to the Wallabies squad in itself.
"It certainly speaks to their quality and strength in depth though, in that they felt in a position to leave some of that ability out of the 31.
"But we're delighted to have Christian with us and it will be extremely exciting to see what he can do. He's hungry, he's been training really well, so we'll just let him do his thing."