The 27-year-old has impressed since joining the Browns when he was selected in the first round of the 2009 draft.
However, his rookie deal is due to expire at the end of next season, leaving the player and the organisation with a decision over his future.
Mack told the Cleveland Plain Dealer: "I'm really happy here. I've had great success with [offensive line coach George Warhop] and being with Joe Thomas and this offensive line is what I want.
"I think I'm a good player and that's really what my goal was to be."At this point in camp, I'm here to work on football stuff.
"All of that stuff is going to be handled by agents and upstairs people. My goal is to not let that distract me."
Mack has played in all 64 possible games since arriving at the club four years ago.