With Baltimore preparing for Sunday's game against the New England Patriots to determine which team will represent the American Football Conference in the February 5 Super Bowl, Reed criticized his quarterback on national radio.
"It was a little funny to me," Flacco told reporters. "I was a little caught off guard. But it is what it is. We talked about it. It's not really that big of a deal."
Flacco, who was sacked five times and pressured during most of last week's 20-13 win over the Houston Texans, completed 14 of 27 passes for 176 yards and two scores during a lackluster day for the Ravens' offense.
Reed, an eight-time Pro Bowler, told Sirius XM Radio on Tuesday that Flacco was "kind of rattled a little bit by (Houston's) defense," adding that "a couple times he needed to get rid of the ball" but was sacked.
"I don't know how much of the play calling he could have made, audibles or anything like that ... but it just didn't look like he had a hold on the offense," he said.
"I understand where Ed's heart's at," he said. "All of our guys. We're together all the time. We know each other. We understand where each other's coming from."
Although he is not in the same class as Patriots three-time Super Bowl-winning quarterback Tom Brady, the Ravens have made the playoffs in each of Flacco's four National Football League seasons and have won at least one postseason game every year.
With a Super Bowl berth on the line Sunday, Baltimore's 13-time Pro Bowl linebacker staunchly defended his quarterback.
"When I first saw that kid throw the football I said, 'That kid is special,'" Lewis, a future Hall of Famer, said of Flacco, a first-round pick by the Ravens in the 2008 NFL Draft.
"And you watch all of these guys who were the top draft picks that are not even in football anymore.
"You're talking about a guy who came into this league that's been in the playoffs all four years and has given this team an opportunity to win games."