The Reds have been strongly linked with a move to bring the Brazilian goalkeeper to Anfield this summer as they bid to try and strengthen their options between the posts this summer.
"From what I've been told, this is unlikely to get done before the World Cup, if at all".
And the German is not ruling out giving reserve stopper Danny Ward the chance to compete with Karius for the No.1 jersey.
Salah went on to have a record-breaking season at Liverpool and is now regarded as one of the best forwards in the world.
Since being given the starting berth at the Stadio Olimpico on a regular basis he's blossomed.
That last piece of the club's new midfield still needs filling though, and with news of a move for West Ham's Manuel Lanzini having been scuppered by an injury sustained on global duty, the shortlist narrows by the day.
According to Maddock, Roma are wary of losing another star player to Liverpool for a bargain price.
Roma have recently done business with the Reds, with Liverpool FC having signed Mohamed Salah from the Italian club last summer. After all, Alisson is only 25, proven at the highest level and is the type of goalkeeper-especially given his excellent distribution-who would fit into a Klopp side well at Anfield.