Rush rates the Egyptian's influence ahead of Sadio Mane.
"You'd probably say game-to-game Mane has been Liverpool's forward player of the season but then I think Salah is still the one that could win them the league," Rush told Sky Sports.
"Salah was out of this world last year. I'm not sure if he got the recognition he deserved but he was never going to score as many goals as he did last season.
"I think he has become a more complete footballer this season because he always seems to have two players marking him now. He's adapted to that and it has probably given Mane more space which he has benefitted from.
"But it's impossible to choose one of them. If I had to choose, I'd choose them both!"