"I've got no control over that [speculation] so I don't worry about it," Bennett said after Knights training.
"I can't give an iron-clad guarantee to anything in this game. Right now, I am the coach here and, when that changes, I'll let you know."
Bennett was lured to the club by the wealth of owner Nathan Tinkler following a successful three-year stint at St George Illawarra on a four-year contract with a A$1 million ($1.14 million) bonus if he delivers a premiership.
But the mining magnate had his fortune drop to A$18 million and was forced to relinquish control of Whitehaven Coal - his key financial asset - to creditors.
But Bennett reiterated his recent support for the Knights' embattled owner. " Without Nathan, we wouldn't be here today," he said. AAP