A state Liberal leader is clinging to power as colleagues plot his demise, with one MP saying he needs to go to give the party a chance at the next election.

Two challengers - Vaucluse MP Kellie Sloane and former minister Alister Henskens - are gunning for NSW Opposition Leader Mark Speakman's position.

Mr Speakman cancelled a round of media interviews on Thursday afternoon as speculation of a looming spill intensified.

One Liberal MP, speaking to AAP on the condition of anonymity, said replacing Mr Speakman was a necessary move.

"We want to win government and it's not about the individual, it's about the team," the MP said.

"It's nothing personal against Mark, it's time ... the emperor is going to have to put on their new gear."

Mr Speakman earlier indicated he wasn't giving up as p

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