Porro is on-loan at Sporting from City, where he has been on the books since 2018.
He told A Bola: "No, I have indeed never spoken to Pep Guardiola.
"I don't think he even knows that I was ever part of Manchester City. But I assume they know what I'm doing there."
Porro's loan with Sporting includes an €8.5m permanent option.
He added: "I can't say anything about it. What I can report is that something big is about to happen this week."
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