Roma have signed Chris Smalling on a season-long loan from Manchester United, the Serie A club announced.
Smalling signed a contract extension at Old Trafford running until 2022 last December, three days before then-manager Jose Mourinho was sacked.
The 29-year-old continued to feature under Ole Gunnar Solskjaer but the arrival of Harry Maguire during the close season left him down the pecking order at centre-back.
He has consequently opted for a temporary move to Roma, who paid United €3million (£2.7m) to seal the deal.
"This is the perfect opportunity for me," Smalling said in a statement.
"The chance to experience a new league, with a big team that has got big aspirations is exactly what I needed.
"Hopefully I can hit the ground running. I'm looking forward to joining up with my team-mates."
Roma sporting director Gianluca Petrachi added: "We are pleased to bring a player like Chris, who has so much experience, to Roma. We are convinced he will help the growth of this squad and all the lads he plays alongside."
Like the similarly long-serving Phil Jones, Smalling has not managed a minute of first-team action this season, with Solskjaer preferring Axel Tuanzebe as back-up to Maguire and Victor Lindelof.
Smalling has 31 caps for England but has not featured since June 2017, having fallen out of favour with national team boss Gareth Southgate.
Roma shared a thrilling 3-3 draw with Genoa on the opening weekend of the Serie A season.
Smalling was identified as the man to shore up a Roma defence shorn of the influential Kostas Manolas, who joined Napoli ahead of the 2019-20 campaign.