Nemanja Matic joins Roma on a one-year deal.
The Serbian made his move to Serie A and reunites with former Man United and Chelsea manager Jose Mourinho.
The 33-year-old left United on a free transfer and made 32 appearances last season.
He will wear the number 21 shirt for the Europa Conference League winners.
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“I am pleased and honoured to be joining this club and I cannot wait to start the new season with my teammates,” Matic said in a statement.
“Roma is a big club, with amazing fans and a coach, Jose Mourinho, who is well known to everyone – making the decision to come here very straightforward.”
Club general manager Tiago Pinto said: “Nemanja brings with him to Roma not just a lot of quality on the pitch, but the vast experience he has gained from so many seasons in the Premier League and a focus and mentality that has consistently set him apart throughout his career.”
“The enthusiasm he showed at the prospect of joining our project was hugely encouraging.”