"There's a frustration on my part that people go 'Oh, Roma's a supermarket, We're not trying to just sell players".
Liverpool raided Roma for Salah back in the summer with the Egypt star moving to Anfield for a fee of £37million.
"When you think about it, (Miralem) Pjanic had a release clause and he had to go".
Roma may not have such a title to their name throughout history, while they have not won Serie A since 2001, but their owner is still bullish about their chances.
At the time of the transfer, Monchi had a hard time believing that Salah would prosper in the English Premier League.
The 25-year-old's four-goal blitz in Liverpool's 5-0 rout of Watford before the global break set a new record for the most goals by a Reds player in his debut campaign.
Roma is having a great season on the European level, as they have qualified to the UEFA Champions League quarter-finals and the draw pit them against the title favorites, Barcelona.
As well as backing Barca to progress over the two legs, Materazzi also expects Real Madrid to prevail against Juventus in a repeat of last season's final.
"The game against Watford was the best I have ever seen him play", said Rush. Obviously, it's an incredible team with incredible talent, not just Leo Messi by any means.
Barcelona hosts Roma in the first leg on Wednesday, April 4 before facing them a week later in the second leg in Italy.
"I see the two Spanish sides [as] favourites to win the Champions League", he added. I think players like [Patrik] Shick are also going to be very useful in the future.