The deal contains a clause stating that Roma must buy the player for a further 8 million euros if certain conditions are met before the end of the loan.
The 25-year-old Jesus struggled to break into Inter's starting line-up under manager Roberto Mancini last season, making just 19 appearances in the league, after being a regular for three seasons at the San Siro.
"AS Roma can confirm the signing of Juan Jesus from Inter Milan. The Brazilian joins on an initial season-long loan for a fee of 2 million euros," Roma said on their website (www.asroma.com).
The central defender, who can also play at left back, joined Inter from Brazilian side Internacional in January 2012.
(Reporting by Silvia Recchimuzzi and Bartosz Dabrowski in Gdynia; editing by Sudipto Ganguly)
