Nationals general manager Mike Rizzo called the anonymous comments made about Bryce Harper "unfair, cowardly and gutless," reports the Washington Post.
A National League executive told FanRag Sports that the outfielder was "overrated" and a "selfish, losing player."
Rizzo responded by saying that was "unfair."
"He’s a champion," Rizzo said. "He’s a winner. Always has been. Always will be. And these anonymous quotes from these unnamed sources like a National League executive, it’s cowardly, it’s chicken s---, and it’s gutless."
He added that whoever made the comments should be exposed.