Roma winger Mohamed Salah could be sidelined until the New Year after being diagnosed with ligament damage in his right ankle, the Serie A side announced Monday.

Salah, who has hit five league goals for the Giallorossi since making his move from Chelsea permanent two months ago, was stretchered off early in the second half of Roma's 2-0 derby win on Sunday following a rash challenge by Senad Lulic.

The Egyptian international's right ankle bent inwards after Lulic ran in and stamped on Salah's foot, leaving the Roma man on the ground in agony, slamming his hand on the turf.

Although fractures were ruled out on Sunday, further tests on Monday revealed Salah has "sustained a grade II ligament damage to his right ankle," according to a club statement.

"It is expected that the Giallorossi No. 11, who has made 11 league appearances for Roma so far this season and is the club's third-highest scorer with six goals in all competitions, will be out for between four and six weeks."

Roma coach Rudi Garcia was furious with the tackle, which somehow went unpunished, and later hit out at officials.

"Tackles like that don't belong, even in a derby. The players need protection," said the Frenchman.

"You've seen the pictures, I'll say no more. I just hope there's no break."

Roma's win left them in third spot in Serie A, one point behind leaders Fiorentina and second-placed Inter Milan following their respective wins away to Sampdoria and Torino.