West Ham United coach Teddy Sheringham says critics shouldn't underestimate Manchester United.
The Hammers host United today.
Sheringham told West Ham TV: "I think from the outside looking in, I don't think Manchester United have been fantastic this year, but they've ground out nice results, especially recently, getting wins when other teams might only get a draw.
"That's the sign of a good team, because when they do click everyone could be in trouble."
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