"We are prepared to face the worst challenge," he said in a statement in ota Kinabalu on Saturday.
Salleh, a former Chief Minister, also questioned the rationale behind LDP Deputy President Datuk Chin Su Phin's outrage on Tuesday, claiming that it was part of an ongoing plot to oust Musa.
He was also convinced that there were "hidden hands" behind it.
"We believe there are people behind it and we know what they are up to, but we in Sabah BN will not allow them to achieve their selfish agenda by mounting a personal attack on Musa.
"I have reliably learnt that certain LDP leaders are in cahoots with certain quarters to topple Musa, and that they even plan to request Prime Minister-cum-BN Chairman Datuk Seri Najib Tun Razak to have Musa removed," he said.
However, Salleh believed not all LDP leaders concurred with Chin's statement that LDP could no longer work with Musa.
In a shocking announcement, Chin was quoted as saying that the party could no longer work with Musa but would continue to support and work together with Umno in the ruling coalition, and expressed full support for the Prime Minister and his 1Malaysia vision.
"We believe the majority of LDP leaders are rational and wise enough to differentiate what is right and what is not, especially when the issues raised by Chin concerned other people's personal interest.
"It would be a different case if the issues raised were of public interest," Salleh said.
As such, he advised LDP leaders not to be easily manipulated by others for their selfish agenda. Salleh is also confident that all other State BN component parties will continue to rally behind Musa, saying the latter had proven his leadership in steering the State since he became Chief Minister in 2003.
Coming from a respected leader, what Salleh said could be true and he is fully aware of who are the `certain quarters' working hand-in-hand with the LDP leaders. Sooner of latter, this all will be made public knowlegde.
It will be no surprise if this `certain quarters' turned out to be `certain Sabah Umno leaders'.