The French champions and the Italian club have both offered 13 million euros to sign the 23-year-old from his current club Sao Paulo, the Sambafoot news portal said on Saturday, reports Xinhua.
Caio has previously been linked with Sevilla and Hamburg, and a move to Valencia last year collapsed after he reportedly failed two medical tests.
He made his international debut for Brazil in June, coming on as a second-half substitute in the Selecao's 2-0 friendly victory over Panama.
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