Chuck Liddell says he's still VERY serious about taking another MMA fight -- he's even naming names -- and kept up his training regimen inside the "Big Brother" house ... just in case.
For the record, Chuck's 48-years-old -- and hasn't had a pro fight since UFC 115 in 2010.
But he trains like a maniac -- and made it a point to keep up his workouts during Celebrity Big Brother because "I didn't want to get too far out of shape."
So, who does he want to fight? He's got some ideas in mind .