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The winger, 21, joins from Spanish side Barcelona on an initial loan deal – for a fee of €1 million.
The agreement also includes the obligation to make the transfer permanent – based on the achievement of certain sporting targets – for a fixed initial payment of €11m.
The deal also includes a number of additional performance-related clauses, worth up to a maximum of €4.5m in additional payments.
If and when the deal is made permanent, Perez has signed a deal with the club that runs until 30 June 2024.
“I know I am leaving a great club like Barcelona, but I’m joining another great club in Rome,” Perez said.
“I’m really happy and I can’t wait to start training alongside my new teammates.”
Perez is a graduate of the fabled Barca youth academy, making his senior debut for his boyhood club in May last year.
This season he made 11 appearances for the club in all competitions – scoring a goal in La Liga and one in the Champions League.
“We are hugely satisfied with Carles’ arrival in Rome,” said club chief executive Guido Fienga.
“Carles learned his trade in one of the best youth academies in Europe, and has been playing for a club with so much talent at its disposal.
“We are all hopeful that he can immediately have a significant role to play within our squad.”
Perez will wear the No. 31 shirt at Roma.
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