The Sao Paulo star has joined on an initial loan.
"To have arrived at Roma is an honour and a pleasure," Toloi told reporters at a Press-conference today.
"I am realising a dream. I hope to be available for selection as soon as possible.
"This is a club of great traditions, every Brazilian player dreams of playing for a big European club.
"I have always worked very hard and now my big chance has come.
"I have had a very nice welcome, not just from the Brazilians. I have only been here for a short time but I can already see it is a close knit group that is very strong.
"I already feel very comfortable here."