The Bosnia-Herzegovina international, who has been heavily linked with Paris Saint-Germain, has committed his future to the Serie A giants until 2018
The Bosnia-Herzegovina international has played a pivotal role in Roma's return to prominence in Serie A this term, missing just two league games as Rudi Garcia's side battled with newly-crowned champions Juventus.
Barcelona, Paris Saint-Germain and Manchester United have been credited with interest in the 24-year-old, whose deal had been set to expire at the end of next season, but Pjanic has now committed his future to the club until June 2018.
A Roma statement read: "AS Roma wish to announce that an agreement has been reached with Miralem Pjanic for the extension of his current contract, which was was due to expire on June 30, 2015.
"The new agreement is for four years, with an expiration date of June 30, 2018."
Pjanic is in the Roma side to face Juventus later on Sunday.