Western Australian Premier Colin Barnett says Troy Buswell will be required to account for the cost of a trip to Europe where the former treasurer spent almost $14,000 on hotels, airport transfers and fine dining.

The trip in August and September last year took Mr Buswell and his then chief-of-staff to the French countryside as part of a study tour to investigate light rail.

Mr Barnett says Mr Buswell will have to justify the expenses in a report that will be tabled in Parliament.

He says Government travel can be costly.

"He's required to produce a report that will be tabled in Parliament and it is up to him to account for what he's done," Mr Barnett said.

"Ministers will stay in good accommodation, [it] doesn't have to be excessive, they have to eat, they have to travel, they have expenses. And international travel at a ministerial level is, by its nature, expensive."

Last month Mr Buswell was fined more than $3,000 and banned from driving for 12 months after admitting crashing his ministerial car into four parked cars in Subiaco earlier this year.

At the time Mr Barnett rejected calls from Opposition Leader Mark McGowan for Mr Buswell to resign as MP for Vasse.

"I think it's a good thing if he continues as the Member for Vasse," Mr Barnett told ABC 720 Mornings.

"He needs to be busy, he needs to be around friends and the people of Vasse have been extraordinarily supportive of Troy, which is a good thing."

The court heard Mr Buswell left a trail of destruction as he drove home from a wedding in his ministerial car in February.

In the wake of the incident, Mr Buswell resigned his portfolios and was described as having a breakdown.

Mr Buswell is due to return to State Parliament this week but Mr Barnett said they had yet to discuss whether he would stay on as an MP.

"That will be up to Troy," Mr Barnett said.

"I would expect that he would see out the term as the Member for Vasse.

"What he does longer term I don't really know.

"At some stage Troy and I will sit down and have a chat about that."

Mr Barnett also said he hoped Mr Buswell made a full recovery from his health problems.