Sherwood was again scathing of Sesko after the Slovenian struck twice in last night's 2-2 draw at Burnley.
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He said of the Manchester United striker on Sky Sports: "I stand by what I said. He's not good enough to play for Man United.
"But fair play to him, hopefully he gets some confidence and we start seeing something different from him."
Sherwood also insists United rely too heavily on Bruno Fernandes.
He added: "When Bruno went off I think they lost control.
"I think he's the one man that can put his foot on the ball. He passes the time over, he passes to the right people at the right time. I think they missed that guile. They're well short of quality, Man United, they really are."