ATLANTA -- Still feeling the effects of a mild concussion, Braves All-Star catcher Brian McCann was held out of the starting lineup Monday and will likely miss at least one more game.

Catcher Clint Sammons, who was promoted from Triple-A Richmond on Monday, batted eighth and made his second Major League start against the Cardinals. The Braves could also use Corky Miller while McCann recovers from the concussion.

"He should be good to go here pretty quick," Braves manager Bobby Cox said of McCann.

McCann suffered a mild concussion during a helmet-to-helmet home-plate collision with Shane Victorino in the sixth inning of the Braves' 12-10 loss to the Phillies on Sunday. McCann was momentarily knocked unconscious, but he was able to slowly walk off the field under his own power. X-rays taken of McCann's neck came back negative.

"It was a pretty ugly collision, so I think he's lucky that [the recovery time] is not longer than it is," Sammons said.

McCann's absence leaves a huge void for the Braves to fill. He was batting .390 with five homers and 15 RBIs in 13 games before the injury.

The Braves' two replacements, Sammons and Miller, don't have nearly the same offensive prowess as McCann.

In 81 games with Richmond this season, Sammons batted .237 with one homer, 18 doubles and 22 RBIs. Miller is batting just .095 (4-for-42) in 13 starts this season.

"It's a chance to come and try to play well, absolutely," said Sammons, who was 2-for-3 with a double against the Astros on Sept. 30. "Brian's a good friend of mine. I never want to see him get hurt, but any way you can get here and get a chance to play a little bit is going to be positive, hopefully."

Sammons' transition back to the big leagues was made easier by having Charlie Morton on the mound Monday. The two played together during the Arizona Fall League and at Richmond.

"It looks like he's a couple of pitches away from having some really good outings, so hopefully we can get it back on track today," Sammons said.