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.
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(Reporting by Silvia Recchimuzzi and Bartosz Dabrowski in Gdynia; editing by Sudipto Ganguly)
