The Federal Liberal Leader Tony Abbott says he is confident the WA Premier will continue to run a strong government, amid speculation Troy Buswell is returning to State Cabinet.

The former Treasurer was forced to resign from the portfolio after he admitted misusing his parliamentary entitlements during an affair with the then Greens MP Adele Carles.

He was later cleared of any wrongdoing, but remains on the backbench.

The Premier Colin Barnett is tipped to announce Mr Buswell will return as the Minister for Housing and Transport next week.

Mr Abbott says it's a matter for the premier.

"I'm confident that the West Australian Liberal Government will continue to be a great political asset for Liberals everywhere," he said.

The State Opposition Leader Eric Ripper believes it is only a matter of time before Mr Buswell again embarrasses the government.

"Mr Buswell gives us an embarrassment about once every six months," he said.

"That's the record and that's what we can look forward to if he's returned to Cabinet."