The former Three Lions player believes Rio Ferdinand has done the right thing in pulling out of Roy Hodgson's squad, insisting he would have done the same in hindsightRio Ferdinand did the right thing by pulling out of Roy Hodgson's England squad.
The former Tottenham and Liverpool midfielder says the Manchester United defender shouldn't join the squad if he isn't capable of training and shouldn't risk his long-term future at Old Trafford.
Redknapp revealed how he picked up a number of injuries during his international career and felt no-one from the England setup cared about him once he was injured.
"I lost so much of my career to injuries picked up on international duty," he told the Daily Mail.
"Liverpool fans used to write to me asking why I bothered carrying on when it was the club who were paying my wages. I understood and, though I am hugely patriotic, if I could have my time again, I wouldn't have gone on those England trips at the expense of my club career.
"My last game for England was a Euro 2000 qualifier against Scotland. I was out injured for a year afterwards and nobody from the FA called to ask how I was.
"Nobody from England cares once you are injured, it’s your club who look after you."
Redknapp says Ferdinand will not forgive himself if he jeopardises his club career in the same way Tottenham defender Ledley King did after his involvement in Fabio Capello's 2010 World Cup squad.
"If Ferdinand comes back injured and jeopardises his United career, he will never forgive himself," he added.
"Also, Roy Hodgson does not want to make the mistake Fabio Capello did when he took Ledley King to the World Cup in 2010.
"King, who also used to manage his injuries on a weekly basis, was injured almost straight away and Capello was left without a key player."