Mason has been on the hunt for a new club after spending the 2015 season with Manly.
According to reports, Mason could now end up at the Rabbitohs.
Mason could be a like-for-like replacement for Grant in the Rabbitohs pack.
The ex-Bulldogs, Roosters, Cowboys, Hull KR, Newcastle and Sea Eagles enforcer turns 36 this year.
Mason could still end up at Catalans if he fails to land an NRL deal.