“Roma represents an opportunity, and a challenge, impossible to turn down," Kumbulla told the official club website.
“I was convinced by the plan the club has in place and I had no hesitations about making this choice - I will do everything to ensure I don't disappoint those who have shown their belief in me."
“As part of the negotiations, two-year loan arrangements for players Mert Cetin, Matteo Cancellieri and Aboudramane Diaby to go in the opposite direction and join Verona have also been agreed.
“When the costs of all loans are weighed against each other, the net cost to Roma is €2 million.
“The overall transaction also includes various obligations, based on the meeting of certain targets, to make all four transfers permanent.
“Assuming the four deals are all completed, the net cost to the Giallorossi will be €13.5m.
“The deal for Kumbulla also includes a number of specific performance-related bonuses, based on the achievements of both the player and the club, that are worth up to a maximum of €3.5m.
“Should the conditions be met to make the transfer permanent, Kumbulla has agreed a contract with the club that runs until 30 June 2025."