After seven years with the team, Perez is to be replaced by Sebastian Vettel whose six-year tenure with Ferrari comes to an end at the conclusion of this campaign.
Renault driver Ricciardo, though, has suggested he had an inkling something was in the offing post-race at Monza.
With Perez hoping to remain in F1, despite the limited number of seats available, Ricciardo said: "He's certainly worthy of a seat, to say the least. As a competitor, I rate him, and as a person, I get on with him.
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"Actually I saw him Sunday after the race and I had a bit of an idea this was going to be announced soon.
"It's obviously fairly late [in the season]. It's not crazy late, I think he's still got time. Where are we? September? Yeah, he's still got time, there are a few seats available. I hope for him he finds a seat."
With just a year in age between the duo, Ricciardo added: "He's still young. He's a year younger than me. What is he? 30? He's young, still a baby!
"I wish him well, I certainly do, and I hope to see him on the grid in '21."
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