The former Spurs boss, 74, was greeted with cheers and claps as he arrived for his first day of filming on the BBC soap, with insiders telling The Daily Mirror that he and Danny Dyer immediately hit it off.
Harry has joined the cast as an associate of Mick Carter, played by 43-year-old Dyer, and the pair have settled into their roles, laughing and joking between takes.
Dyer is a Spurs fan, and is delighted to be working alongside Harry, who played for the club's youth team in the 1960s and returned as manager between 2008 and 2012.
Sources say that the two have become 'inseparable' during their eight-hour days of filming.
Harry first at arrived at the BBC's Elstree studios on Tuesday at 8am, with the news kept under wraps. He was taken to work in a chauffeur-driven car, which took him through the gates.
He was then checked for Covid by staff before he was allowed on set.
On his second day, he drove himself there in his silver Range Rover, for another day of filming.
An insider told The Mirror: "Harry isn't a bad actor, especially for EastEnders. He brought a real-life Cockney feel.
"It looks like this might not be the last viewers see of him. He and Danny were a great team-up.
"They were both clearly over the moon to be working with each other. Everyone adored having Harry around."
The ex-footie boss cemented his status as a national treasure after his appearance on I'm a Celebrity... in 2018, when he won the series.
Now he also presents Sky One chat show Redknapp's Big Night Out with his son, ex-footballer and pundit Jamie Redknapp.
The pair recently welcomed Line of Duty's Martin Compston on to the show, ahead of tonight's (2 May) season finale.
Speaking to both the father-son duo, 36-year-old Compston explained he once let slip on Twitter that fearsome cop Lindsay Denton (magnificently played by Keeley Hawes) was returning in season three - a spoiler that the Line of Duty team had fought to keep hidden.
He said: "I was living in LA at the time and I think it was when Keeley Hawes came back so I put out 'she's back everybody'.
"But I forgot the clocks went forward in the UK so I put it out at 8 and the show came on at 9."
However, Martin got away with the major error by the skin of his teeth.
"Luckily everyone was going 'what the f**k are you on about?'" he laughed. "From that moment I've got the fear big time."
Featured Image Credit: PA
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