The Packers do not have any quarterbacks on their practice squad. Brian Wrobel, who played in NFL Europe last spring, spent most of training camp with the Packers before he was released.
McCarthy indicated that Favre, who has started 251 straight games, is beginning to regain strength in his arm, and will know more on Wednesday when the team begins its preparations for its Monday Night Football game at Seattle.
"His elbow, I think is going to be fine," McCarthy said. "He's been in (this morning) for treatment for both the elbow and the groin. We'll re-evaluate him on Wednesday. He doesn't seem very concerned about it."
Favre was injured late in the second quarter in Green Bay's 35-0 loss to the Patriots at Lambeau Field. Favre was sacked by linebacker Tully Banta-Cain, then forced to the ground by linebacker Tedy Bruschi. McCarthy said it appeared that Favre injured nerves in his right elbow (funny bone) when he hit the ground.
"My thought was that his elbow hit the ground, than (Bruschi's) helmet, like we originally thought," McCarthy said.
Rodgers was injured sometime during the third quarter, and played the entire fourth quarter with a broken bone in his foot. McCarthy said Rodgers' injury is similar to the one that cornerback Will Blackmon sustained during an off-season mini-camp in May.
"After watching the film, I think it was on a scramble," McCarthy said of Rodgers' injury. "That would be my guess. You can see he starts limping a little bit after that point in the game. Based on the way his body was and the torque that he put on his foot, that would be my guess, but I'm not sure."
For Rodgers, who prepared to be Green Bay's starter during the spring when Favre was uncertain about returning, it's a big setback. He had played only in garbage time of Green Bay's 31-9 loss to the Philadelphia Eagles Oct. 2 before entering the game for Favre with 1:41 left in the second quarter on Sunday.
"On a personal level, you feel terrible for him because the first thing you think about is, here's a guy who has been here since March 20," McCarthy said. "He's been here every day, went through the quarterbacks school, getting ready to be the potential starter for our football team and was getting ready to play, then that happens to him. I feel bad for him on a personal level, but as a professional he has a lot of room to grow."
Rodgers completed 4 of 12 passes for 32 yards against the Patriots. He also rushed for 11 yards, was sacked three times and lost a fumble.
Rodgers was the Packers' first-round draft choice (24th overall) in 2005, and he played extensively in just one game last year. At Baltimore on Dec. 19, Rodgers completed eight of 15 passes for 65 yards with one interception.