The 29-year-old joins the Giallorossi on a €1m loan deal with an option to buy for €13m.
Oliveira declared: “It's amazing to be here at this great club.
“Roma have always shown a real interest in me and now I want to try and immediately help the team to achieve all its targets and continue to develop the right mentality.
“I am certain that my new teammates, alongside whom I cannot wait to start working, will help me continue to improve too."
“He has won a lot during his career and has gained experience at the highest levels, representing both his club and his country in some of the most important competitions in the world.
“His desire to join Roma was decisive in us being able to find an agreement: we believe it is very important that we continue to bring in players that are eager to play for this club."
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