He admits English football muscled out small players when Wimbledon were successful in the 1980s.
Redknapp said: "It all changed then. Don't get me wrong. They got the best out of what they had.
"They were amazing but then a lot more teams went that way because they didn't have the players.
"But Brendan Rodgers has done it in a different way with Swansea and if you are going to be successful at the very top level you have to be able to keep the ball and play.
"We had a young goalkeeper who went out on loan to Barnsley and their boss said they wanted a keeper who could use his feet and play the ball out - like the Swansea keeper does.
"Joe Cole said recently that at Lille the goalkeeper there could play in midfield in England. That is what we are going for here. Once, small players like Leon Britton were being lost to the game. I signed him as a kid. Look at Barcelona now and the way they play and realise you don't have to be 6ft tall.
"The Messis and the Iniestas are little guys with great technical ability. It's changing here now and that's good."