The Cameroon defender and Spurs midfielder Tom Carroll signed for the Rs last night.
Left-back Assou-Ekotto, who is currently on international duty with Cameroon, told the club's official website: "It is fantastic to be linking up with Harry (Redknapp) again.
"I enjoyed my best form at Spurs under him and am looking forward to doing my best for QPR.
"I know the way Harry likes his sides to play, and it is a style that suits me which is why I am excited about this opportunity.
"QPR have made a great start and I can't wait to help them build on that during my time here."
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