Redknapp managed the Hammers between 1994 and 2001, and helped bring through the likes of Frank Lampard, Rio Ferdinand, Joe Cole, Jermain Defoe, Glen Johnson and Michael Carrick at Upton Park.
And the former Tottenham and Portsmouth boss believes that group was equal in quality to the academy graduates who became first-teamers at United in the mid-1990s – a crop which included Paul Scholes, David Beckham, Ryan Giggs, Gary Neville, Phil Neville and Nicky Butt.
“People always talk about Manchester United producing the Class of ’92 but they weren’t any better than the six boys we produced at West Ham,” Redknapp told The Athletic.
“If you put those two groups of six against each other, there would be nothing in it.
“Ferdinand went on to win championships, Frank Lampard won everything, Cole won everything and Michael Carrick won everything. Then you have Glen Johnson who won Premier League titles, and Jermain Defoe who had a terrific career.
"If the kids had stayed at West Ham, what a team that would have been. That would’ve been six England internationals in one team. That was the difference. Manchester United kept their youngsters and that’s what enabled them to become a great team.
“If I kept those six players together I’m certain I would have won the Premier League.”
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