And former Manchester United striker Dublin is not pleased with how the players have conducted themselves.
“I genuinely believe Jose Mourinho will turn this around because he has a really good crop of players,” the BBC 5Live pundit said.
“But they have to find a way to work together.
"There are too many players doing their own thing and talking behind each other’s backs.
Jose Mourinho: Manchester United face Valencia tonight (Image: REUTERS)
Jose Mourinho: The Manchester United boss has been backed by Dion Dublin (Image: GETTY)
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Jose Mourinho appears to train squad in separate groups
“They’ve all got to grow up and appreciate where they are.”
Mourinho has been allowed to spend over £300m on new players since his arrival at United in 2016.
Yet there are accusations the squad lacks leaders - something Dublin admits is a problem for the manager.
“I don’t think there are many Manchester United players that are brave enough to take the challenge of being in charge on the pitch,” he said.