United were beaten 2-1 by ten-man Newcastle at St James' Park, with William Osula scoring a 90 minute winner.
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Reflecting on the result, the players felt they were well below standards on the night.
A source told The Sun: “The players feel like they let the manager down with the way they played.
“They think the big gaps between games are hurting them and making them struggle to start properly.
“It’s something they are aware of and want to change.”
