Leben, 33, has dropped five of his last six, including his last four in a row.
At UFC 168, he quit on the stool after getting rocked by Hall for the entire opening frame. Leben wouldn't come out for the second round after Hall busted him up for most of the first five minutes of their bout.
"I’m done, man," Leben told his corner as he walked back to his stool following the opening round.
It was a wise decision by Leben, who was clearly out of it as the bell rang after the first round.
"Chris is a tough guy, and I know how bad he wanted to come back and how bad he wanted to fight," Dana White said of Leben in the UFC 168 post-fight press conference. "It was a perfect fight for him against Uriah. You know how tough Chris is, and for Chris to quit on the stool, he was hurt."
If Leben does call it quits, he leaves the UFC with a 12-10 overall record.
White wouldn't officially confirm that Leben will get cut with the loss.
"Well, the guy’s not making a decision right there on the spot, and I don’t think that there’s ever a situation where…you look at it before the fight happens, and you say, ‘yeah, these guys both need to win this fight,’ but you never know what’s going to happen in a fight," White said. "The fight could be a knock down, drag them out war, that at the end of the day you have so much respect for the guys you wouldn’t want to cut either guy.
"So I don’t really look at it that way. I wait and see what happens. It’s like Bobby Voelker, who fought earlier tonight. You know, he’s 0-3 and not going anywhere. He took the Robbie Lawler fight on short notice, and tonight [against William Macario] he was busted up but he keeps moving forward and trying to win. We don’t cut guys like that."