McCann went 0-for-4 and was charged with a passed ball in his return in the Braves' 8-2 loss. Still, he said he felt good and expects to play Tuesday.
"I felt fine today," he said. "I felt like I couldn't have picked a better day to come back."
Prior to Monday's game, McCann had last caught on Friday, when he was forced into action after backup catcher David Ross strained his right groin in a second-inning at-bat. McCann said having to catch seven innings set him back a couple days.
"The day I went in there, I was just about getting over it," McCann said. "Then that night was pretty rough."
McCann said it was especially frustrating to be so sick in the middle of the season, because he has never been sick for more than a few days in a row.
"There's nothing you can do about it except get healthy and get back in there," he said. "That's the thing about baseball. It's an everyday sport. Six days doesn't seem like that, but that's six games that you're not playing in."