The club legend feels the 34-year-old has a role to play at Anfield with his years of experience and ability to motivate, even if his on-pitch performances are not the best
After 114 caps and 21 goals for England, the 34-year-old announced his international retirement on Monday following a poor World Cup showing in Brazil.
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"It's how well the manager coaches him really. I think there's still another two years left in Steven Gerrard," Rush is as quoted as saying by FourFourTwo.
"It's not just about physically, I think being in the dressing room before that, motivating people, getting people going and that's what he's all about. He's a leader and we need those leaders.
"Even if they're not producing the best on the pitch we need them in there. Without a doubt if the manager treats him well he's got another two years left in him."
Rush said Gerrard's international retirement was great news for the club, with it possibly extending his Liverpool career, but former striker Robbie Fowler believes Gerrard could have played on for England.
"What we should remember is how good Steven Gerrard was for England, that's his decision and we've got to respect that, but for me, I think he could have played on," Fowler said.
"He was voted one of the best players in the Premier League last year, voted by all his peers, and that tells me that he's still highly thought of and still very much good enough to play for England, so it is a sad day, but let's respect Steve's decision."