The veteran tackle has had little work since injuring a hamstring in Green Bay's victory over Detroit on Nov. 26, but McCarthy liked what he saw in practice on Saturday.
"I feel better about him today than I did two days ago," McCarthy said of Clifton, who is listed as probable for the game despite having limited work throughout the week.
"I feel very good the way he came out of the week," McCarthy said. "Today, the way he responded to his work yesterday was definitely a positive. We'll see how the next 50 hours go, but he looks like he has a chance to be ready to go."
Rookie T.J. Lang is Clifton's backup and has gained starting experience at both tackle spots in recent weeks, but is questionable for the game because of a concussion he sustained in practice Thursday. He didn't practice the last two days.
Barbre took most of the first-string reps at left tackle the last couple days.
"If my name's called [Monday], I'm definitely going to be ready and go out there and fill in," Barbre said.
He acknowledged that he's hungry to contribute following his demotion after seven games because of inconsistent play and then being inactive the last two games because of an ankle injury.
Barbre has played at left guard and right tackle in his first three pro seasons with the Packers. He also has experience at left tackle, making all but one of his 36 starts there for Missouri Southern State.
The uncertainty at left tackle means the Packers will be counting on Tauscher to play a full game Monday for the first time in more than a year.
"I think Mark is ready for that," McCarthy said. "That's the outlook going into Monday night's game. We're going to head down that path."
Tauscher suffered a season-ending knee injury late last year, underwent surgery in January and didn't return to football until the Packers re-signed him a month into the season.
He started three of the past four games, but was replaced by Lang for a few series in each to rest the knee.
Also on Saturday, Packers linebacker Jeremy Thompson was released from a Green Bay hospital Saturday morning.
Thompson was taken by ambulance from the team's practice facility after spraining his neck toward the end of practice Friday.
"He's doing very well," McCarthy said. "He went through all of the testing yesterday [and] will have pretty much a full recovery. It was a scary situation for everybody. We're just glad that he's going to be OK."
Thompson didn't lose consciousness or suffer any paralysis when he was injured while trying to make a tackle.
He won't play Monday, and his prognosis for playing again by the end of the season hasn't been determined.
McCarthy, however, indicated that Thompson's injury isn't career-threatening, although he has been prone to neck stingers his first two years in the league.
"This is a positive day," McCarthy said. "You never want to see anybody in that position, and to see one of your players taken off the field yesterday was definitely a very nervous time for all of us."