Danny Ings joined from Burnley and featured heavily through pre-season before his competitive debut in the second half of the 3-0 defeat to West Ham United prior to the international break, while Christian Benteke signed from Aston Villa for £32.5 million from Aston Villa - as reported by the BBC - making him the club's second most expensive player ever.
Rush thought the Reds needed someone of Benteke's ilk; a powerful centre-forward that is not only quick and looks to take on men, but who can hold up the ball to bring others into play, and win the aerial battle.
He told Sky Sports: "Benteke gives Liverpool a different option and I think he's probably a bit better on the ground than people think. Technically, he's very good but he's also a good get out for Simon Mignolet.
"Liverpool like to play at the back but sometimes they overplay and he can be that get out because he is good in the air and it allows Simon Mignolet to kick the ball down the field knowing Benteke is a good outlet."
Benteke's presence certainly seems to make life a lot easier for Simon Mignolet, as the Reds' goalkeeper has notoriously struggled with his kicking and playing out from the back - much like other members of the Reds' defensive unit and there have been times when they have got themselves into trouble by trying to overplay along the back line. The Belgian's presence up front at least gives the Reds a good option to get rid of the ball quickly - but he is not just there to be 'the big man up front'.
As for Ings, Liverpool fans have yet to see what he can really do, though he did impress on the pre-season tour with his movement, and managed to get a goal in Australia.
With Philippe Coutinho suspended for this weekend's game against Manchester United, he may be an option that Brendan Rodgers would look to exploit as someone that can do all the hard running in the channels, but also offer an option of playing different systems in the game for the manager without having to make a substitution.
Rush added: "I was very impressed with Danny Ings in pre-season and he is a quality player that can come on.
"I watched him in pre-season and for me he is very clever with the way that he makes his runs. He plays off the shoulder of the defender and he makes his runs early."
Rush would certainly be a fine judge as to whether he thinks a forward has the capabilities to make an effective contribution for Liverpool.
He talks about Ings as if he will be used more as an option from the bench, and given that he has been named on the bench for the first four games of the league season, it certainly seems to be what the manager has in mind for him.
But he will get his opportunity to start in the coming weeks, given the upcoming matches both in the Europa League and the League Cup will lead to the squad being freshened up so the side can try and compete on as many fronts as possible.
For both players, age is certainly on their side but they have different roles. There does seem to be a lot more pressure on Benteke to deliver the goods than Ings right now.