The Argentine completed his transfer from River Plate last month, but was only presented to the media today following international duty.
"Roma are a great side, one of the biggest clubs in Italy and the world, which is why I wanted to come here," said Lamela in his Press conference.
"I know there are great players in this team and legends have worn the shirt in the past, but I am not afraid. In fact, I'm happy to form a part of this squad.
"I spoke to Luis Enrique and Francesco Totti a little bit today, as well as my other teammates, but I'm still learning Italian.
"I know the Giallorossi fans are as passionate as the River Plate supporters. I can only pledge to give my all, every time."