The Glasgow Warriors flanker will line up against the Barbarians at Murrayfield on Saturday as head coach Matt Williams prepares his team for the Tests against the Wallabies and Samoa.

Williams' tenure started with five defeats - including a 31-0 home reverse by France - earlier this year.

But Mather, who returned from a three-year international exile for the RBS 6 Nations, believes the World Cup runners-up should be wary of a backlash when the Scots play their first Test against Australia in Sydney on June 13.

He said: "After this tour, leading into next year's Six Nations, the Scottish public will see a change in the way we are playing rugby and, hopefully, we will have more success as well.

"In some terms, we are an unknown quantity because we did not have the greatest of Six Nations and our players are not household names or anything like that.

"The Australian public will not know what to expect from us and, hopefully, neither will the Australian team.''

But the 31-year-old back-row forward believes Scotland can take great heart from the final game of the RBS 6 Nations, where a spirited display ensured there would be some confidence in the camp despite the 37-16 defeat in Ireland.

Mather said: "I am looking at the Barbarians game as a fourth Test, so it is crucial we get a win to give us confidence, or at least a performance.

"I thought huge strides were made against Ireland in the last game in the Six Nations and, although we did not get the result, we were starting to play better rugby against a very good side.

"If we can carry that momentum into this game, then that would be good.

"We have got a great tour coming up, which is a once-in-a-lifetime chance for some of these guys, so morale is good.

"Hopefully, Matt knows a lot more about some of the younger guys now as well and they will come through.

"I think Matt has taken it on the chin and has had the guts to pick the younger guys that should probably be playing in the Under-20 World Cup.

"These are players for the future and he is blooding them now and we might not be winning games but it is going to hold us in good stead for the future.

"The talent of guys like Chris Cusiter and Tom Philip is great and you have to remember that they are only young and are playing against men who have been playing international rugby for 10 years.

"It will take time but it is not going to be the overnight success that everyone thought it would be and we are quite realistic in realising it is not going to happen suddenly.''