A deal has been done to replace Liberal leader Mike Nahan with his deputy Liza Harvey before the next state election.

WAtoday and Nine News Perth has learned that an amicable arrangement was put in place some time ago, but the deal will not be triggered until next year.

WA Opposition Leader Mike Nahan. Credit:AAP Image/Rebecca Le May

The revelation emerged as Dr Nahan was again forced to deal with speculation about his leadership as Parliament returned for three weeks ahead of the winter recess.

Dr Nahan responded with a “no comment” when asked if he had talked about resigning as leader.