The Manchester City midfielder was speaking about his international colleague after their dramatic 3-2 win over Ghana at the World Cup on Thursday.
Ronaldo won and scored a penalty to give his side the lead in the second half of the contest, having been released by Manchester United earlier in the week.
Post-game, Silva said: “We are happy to know that we can still count on Cristiano – not just the goal but he worked a lot for the team. What he does now is his decision and the decision of whoever it is who offers him a contract.
“I think he can still play at the very top. It depends on what Ronaldo wants. I don't know what he wants for his life. He has to speak with his family and decide for himself, right?
“I support his decision in terms of it's his decision. He's my team-mate in Portugal – if he's happy, we're happy. He's been fine, he's been great."
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