However the club remains without a recognised hooker for next season, with axed No.9 James Segeyaro told he won't be offered a new contract and current rake Peter Wallace also without a deal.
Wallace, who was replaced as captain by Matt Moylan over the summer, is understood to be close to re-signing with the Panthers on a one-year deal.
The 27-year-old Tamou, who is currently in camp with the Blues preparing for Wednesday's must-win State of Origin clash in Brisbane, believes Penrith are on the cusp of winning a premiership.
"Where I can win another comp, that's what I base my decision on," Tamou told Fairfax Media.
"After getting the first one last year, you just want more of that feeling. I want another one. Penrith mate, they are definitely on the up.
"A big forward pack, good backs. Obviously a few of their players are here as well as Carty (Bryce Cartwright) coming in. My decision is based on where I can win another premiership."
Tamou has played 158 games since making his debut with the Cowboys in 2009, represented NSW 12 times, and appeared in 12 Tests for Australia.
- AAP