Alex Volkanovski ain't done G.O.A.T. hunting ... 'cause the new UFC champ -- fresh off taking out Max Holloway -- tells TMZ Sports he's got his eye on another legendary fighter.
We were talking to the the 31-year-old featherweight champ when the convo moved to going up to 155 pounds ... and fighting the undefeated Daghestani superstar.
"I'm not going looking for these fights, but you'd be silly if it doesn't cross your mind," Volkanovski says.
"I'm the type of person, I'll look at all opportunities and I'll at least let me play in my head.