But the veteran big-game player said he had "high expectations" of featuring in the finals, playing in a rugged pack bolstered by renowned enforcers Jeremy Smith, Beau Scott and David Fa'alogo.
"For years I've battled against Jeremy Smith and Beau Scott," he said.
"They're two blokes I don't really like playing against."
Having accepted a cut-price $40,000 deal to join Newcastle last season, Mason said he struck a handshake deal with coach Wayne Bennett months ago to extend his stay.
"I've never really been about money," he said.
"I was at the Dogs for years and took pay cuts just to stay in a good team."
Mason made his Knights debut in round eight and did not miss a game for the rest of the season, prompting speculation that he could be in line for a NSW Origin recall next year if his form continues.
"I've been watching Origin for the last three or four years, and if I play to the best of my ability, I'm pretty sure I could handle Origin," he said.
● The NRL will take no further action against Danny Buderus after his short-lived stint as a coaching consultant with the ACT Brumbies rugby club.
A spokesman said the NRL was "comfortable" with the Knights' explanation.