Roberto left Barcelona for Como last year after speaking with his former Blaugrana teammate.
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After their Coppa Italia win against Fiorentina, Roberto said: "He's a gift to us, in training and in matches.
"I've had top coaches in my career, but I already put Cesc among the best. People see him, and we enjoy ourselves in matches.
"On the pitch, we all know what to do, and we have to keep it up."
Roberto also said: "The most important thing today was to win and focus on the next match. We're very happy for Alvaro (Morata), his first goal for Como and my first goal too.
"Scoring is always important for a striker; the team is united and it's a very special group."