The Egypt international, who starred on loan for Fiorentina in the second half of last season, was seen at Fiumicino airport in Rome on Wednesday.
Roma are set to pay £1.4million in loan fees with a buyout figure of £16m for the pacey winger.
Salah's agent Ramy Abbas confirmed the move to KingFut.com: "Sure, after the results of the medical are concluded, they can take one to two days.
"Furthermore, Salah will only accept a loan where the club has an obligation to buy him, not an option to buy him."Lots and lots of teams were interested in Salah."