Sinclair can see Phillips joining Manchester United.
Speaking to talkSPORT, Sinclair said: "I think Kalvin Phillips is ready.
“If Leeds do not really pick up this season and start threatening that top four, I think Kalvin Phillips will go.
“I was actually quite surprised that Manchester United did not have a little look at him because when you start looking at that holding midfield role, and you have got Fred and (Scott) McTominay, (Nemanja) Matic.
“For me if they have got that position right, they will have a chance at really competing for the Premier League."
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