Roma midfielder Miralem Pjanic has been ruled out of action for a month with an ankle injury.

PA PhotosMiralem Pjanic's injury is a blow to Roma

Pjanic, 22, was forced off during the first half of the Giallorossi's 3-1 win against Genoa on Sunday.

The Bosnia international underwent tests on Tuesday which showed that he had picked up a ligament injury in his left ankle.

Roma said in an official statement: "The prognosis is four weeks, the footballer will start rehabilitation from today (Tuesday).''

The capital club take on city rivals Lazio in Serie A on April 7 - a fixture that could well represent the player's comeback date.

Pjanic, who signed for Roma from Lyon in 2011, has hit four goals in 20 appearances this season.