The 34-year-old spent the second half of last season with Tottenham, making eight appearances after arriving at White Hart Lane on a short-term deal from Blackburn and his move to QPR will throw up a reunion with Mark Hughes.
The New Zealand international was signed for Blackburn by Hughes from DC United midway through the 2004/05 season and he made over 200 appearances during his time at Ewood Park.
He admits the chance to play under Hughes again was too good to pass up and he is hoping he can make a contribution for QPR next season.
"I owe him pretty much everything. He gave me my chance (at Blackburn in 2005),'' Nelsen told Fairfax.
"That was a big factor. I know Mark and his staff really well, and they all really helped me when I was first over here in England, so it's nice to go full circle towards the end of my career. Hopefully, I can still help them out.''
Although QPR narrowly avoided relegation from the Premier League last term, Nelsen believes he has made the right choice and is excited about the club's potential.
He added: "They've got a lot of ambition - it seems like it's going to be a good fit."
Neymar's move from Santos to Barcelona is no doubt the biggest summer transfer.
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