The Red Devils sit in 14th place in the Premier League after a tough start to the season.
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Ten Hag is on thin ice as head coach, while Fernandes is not enjoying a good season so far.
On the duo, Brown told Football Insider: "It wouldn't surprise me if the players were getting frustrated. I don't believe Bruno would have downed tools, though.
“People have said maybe he's not playing for the manager, but that's not what I’m hearing, and I haven't heard anything about a disagreement between them."