The ex-England international was released by the Red Devils at the end of last season after 12 years at Old Trafford.
During that period, Ferdinand established himself as one of the best centre-backs in the world and won trophies galore.
The former Leeds United star clinched the Premier League six times, the FA Cup once, the League Cup twice and the Champions League on one occasion.
Last season Ferdinand struggled with injuries and did not play regularly, and was eventually let go by United. QPR came calling for the ex-West Ham United star, who signed a one-year contract with the London club.
Ferdinand has now revealed that had Rangers not made an offer to him, then he would have retired.
‘I was really keen to come back to London, it’s where I’m from and it’s where my family were keen to come back to after it became clear that I wouldn’t be staying at United.
‘It was only ever going to be London that I’d go to, as I wasn’t interested in going abroad or chasing a load of money. It all fell into place for me nicely’.
Ferdinand, though, has struggled to play well so far this season for QPR. Some will almost certainly suggest that it would have been better for him had he hung up his boots.