Rush is convinced Salah is currently the best player in the world.
"I spoke to Mo last season and he told me he wants to be the best in the world," Rush told the Liverpool Echo.
"He's upped his game this year. It's not just about him scoring goals and people will say he's selfish and whatever, but he's been supplying assists as well this season.
"Of course he has scored great goals and he was the fastest to 100 goals, that is all great. Fantastic. But he is playing for the team as well.
"He is running back now, defending more and he has told himself if he wants to be the best player in the world, he has to up his game and he's certainly done that.
"He said to me his aim was to be the best player in the world. And on present form he is the best player in the world. He is doing that right now.
"I speak to Mo a lot and funnily enough I met Mo at the Leeds game (in September) and I was having a chat with him and he said to me: 'How the hell did you score 300 goals!?'
"So I had to remind him, actually, it was 346!
"So we have a laugh and a joke about it, but he knows what it takes. Look, records are there to be broken.
"And if you're going to beat records like that you need to stay free of injury and that's the thing with Salah, he very rarely gets injured.
"If you get injured it doesn't help, but I've set him a target, it's there, so let's see if he can break it!"
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