QPR have confirmed the signing of defender Rob Dickie from Oxford United.
The deal is worth up to £1.8m and Dickie has signed a four-year contract.
Rangers were keen to bring in at least one centre-back this summer and Dickie has long been their first choice.
West London Sport revealed QPR’s interest in him earlier this month and more recently revealed that they were very much in the running to sign him despite reports of interest from Premier League clubs.
West London Sport also revealed that he would be signing four-year deal - and previously revealed that Rangers would pay-off Toni Leistner to make room for the new acquisition.
Dickie played a key role in helping Oxford reach last season's League One play-off final, which they lost to Wycombe.
He was in the final year of his contract and keen to move on.
“I am really, really excited and can’t wait to get going,” Dickie told Rangers' website.
“The manager had a big influence on my decision. I got a really good feeling off him.
“I watched a lot of QPR last year. I really like how they played and how the manager set them up.
"I feel this is a really good fit for me because of how I like to play. It feels like the right club for me.”
Rangers manager Warburton has been looking to bring in a combative central defender who is also good on the ball.
Dickie was identified as the top target, although enquiries were made about Charlie Goode, who joined Brentford.
Warburton said: “He is a talented ball player and is aware of how we like to play.
“He is a very talented young player, he has proven himself at Oxford, showing his undoubted quality, and is more than ready to step up.
“He likes to get on the ball, he makes good decisions and has good physicality about him as well which you have to have in the Championship - but he is also a young player with lots of development potential.
“He is a tremendous addition to our squad.”
Warburton is now looking to add at least one attacking player to his squad before the season gets under way.
Potential replacements for Bright Osayi-Samuel are also being lined up.
Rangers want Osayi-Samuel and Ryan Manning to agree new deals and are ready to sell them if they continue to refuse to sign.