Eddie Howe says frank public criticism from Bournemouth captain Steve Cook is unhealthy and will not aid the club's Premier League relegation scrap.
Defender Cook reportedly said the Cherries "played like kids" following Wednesday's humiliating 4-1 home loss to Newcastle.
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The struggling south-coast club sit second bottom of the division and have gone seven games without a win ahead of Saturday's trip to in-form Manchester United.
Howe is eager for players' critical views to remain private and urged his squad to stick together in the battle to beat the drop.
"Listen, I don't think they are helpful for us," the Bournemouth manager said of Cook's comments.
"When you don't perform well, I think everything needs to be internal - that's always been how I've worked, we keep things in-house, and our opinions of ourselves stay that way.
"I have a duty when I come to the media to tell the truth in respect of what I think of our performances and I don't think it's healthy to view ourselves or read ourselves in that way.
"For the collective good of the group and the club, we know recent performances haven't been good enough, I don't think you need to be too clever to work that out.
"Nothing can change the past, we can only change the future and the only way we're going to do that is to stay together."
Howe, who has guided the club from the fourth tier to the Premier League during his two spells as manager, admits he is under-performing in his role but insists worrying about his future is futile.
"Fearing the sack is not helpful or productive in any way," he said. "What am I going to do, sit at home and worry about my future? No. I'm going to try and make the team play better and try and focus all of my energies on what we deliver on the training ground, how I speak to my players.
"I am a realist. I know football is all about results, it doesn't matter how long you've been at a football club, you need to win games. But I can only affect what I'm doing right now.
"As manager you take responsibility for everything and that's the way it should be, and it has to be, and it will continue to be.
"I know my work - for whatever reason - hasn't been good enough and together with the players we fight on to try and turn things around."