With the npower Championship club looking to secure an immediate return to the Barclays Premier League, Redknapp has taken the decision to bolster his coaching staff with McClaren taking a role alongside the likes of Kevin Bond and Joe Jordan.
McClaren's actual role has yet to be defined, as has the length of his contract, but the appointment of the 52-year-old - who ended a second spell as manager of FC Twente when he resigned in February, has been met with joy by Redknapp.
"I am delighted to have been able to bring Steve in," he said.
"Everyone in the game knows what a top coach he is and he'll add something different to the group, regardless of how long he is with us for.
"This is a very important season for us and I wanted to look at freshening up the whole place, not just the playing side.
"I want new ideas, different opinions and another experienced head to speak to. That's what Steve brings.
"Along with Kevin [Bond] and Joe [Jordan] I've got a brilliant backroom team and their input is going to be so important for me this season. Steve adds to the excellent staff I already have here."
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- Kevin Bond