Aaron Rodgers initially appeared to suffer a significant knee injury during the first half of Sunday's game against the Bears.
The Vikings also have four players on their injury report.
"Frankly, at halftime we were preparing as an offensive staff to play with DeShone (Kizer) and then shortly before we got out to the field, as we were walking to the tunnel, I had a chance to talk to Aaron and Dr McKenzie and he was cleared to go".
The team has yet to determine if Rodgers will even be able to practice at all this week ahead of their home opener.
"We'll see what tomorrow brings", McCarthy said.
The protection was better, the crowd came to life, and that 75-yard dagger to Randall Cobb to steal away the game was exactly what football fans needed to end the Sunday games. "He'll be given the whole week to get ready". We also know he's doing group rehab at the moment.
When the Vikings and Packers get together, it's often anybody's game but if you're looking where Minnesota might have an advantage it's perhaps on offense where experienced receivers will square off with a young Green Bay secondary.
"You hate that you're dealing with something like this in the first week, but you feel similar to this Week 13, 14, 15, 16, 17", Rodgers said. It wouldn't be ideal for him to miss a full week of practice before playing, but Rodgers could handle it.
"It was going to have to take something really catastrophic injury-wise to keep me off the field in the second half (against Bears)".
Rodgers has played before with an injured left knee. There were a couple throws in which Rodgers said he got a "jolt" of pain after putting weight on his left leg.
"Obviously there's the hope of playing", McCarthy said.
The Packers can't just sit Rodgers if he feels well enough to play, especially considering it's a big divisional game.
Jones, a second-year safety, missed Week 1 while still recovering from an ankle injury.