Boa Morte joined Silva's staff this summer.
He said on the Alan Myers Everton podcast, "We played together when we were 15, 16. We always had a good relationship.
"We've always been friends even when we went different ways. I think he was better when we used to play for the same team!
"He was a tough right-back. Always had tough battles, but that's the way it goes.
"We ended up going to the same club a few years later, working for the same club a few years later. Then opposite ways again.
"Now he gave me a chance to be part of his coaching team, and I'm really happy and pleased."
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