The Real Madrid star faces Sporting in the Champions League tonight.
And De Carvalho hopes Ronaldo will finish his career back in Lisbon.
"Yes, without a doubt, I would love for Ronaldo to end his career here, at home," De Carvalho told Marca.
"He represents a lot for us and it would be beautiful if he could end his career here. He is a world ambassador.
"Cristiano always speaks well about us - he is very fond of the club.
"As we found out when we saw his face when the draw came out, we are playing against our boy. It's going to be beautiful.
"I believe selling Ronaldo (to Manchester United) was a bad business deal both in sporting and financial aspects, I think he was also too young to leave."