The experienced left-back has arrived at Loftus Road on the eve of the 2015/16 Championship season and both manager Chris Ramsey and director of football Les Ferdinand feel the addition of the 34-year-old will only add value to the R's squad.
"I'm really pleased we've managed to get Paul in ahead of Saturday," Ramsey told the club's official website.
"Left-back is an area we're light on in terms of numbers at the moment, owing to a couple of injuries, so Paul will come in and compete for the shirt immediately.
"He's got years of experience playing in both the Premier League and the Championship, and he'll come in and add that knowledge and know-how, as well as his undoubted defensive qualities, to the group."
Ferdinand added: "Paul is a proven performer, year on year, with a wealth of experience.
"He's always been a physically fit player - his stats back that up - and the fact he played 29 times for Leicester last season shows he's very much up for the challenge that lies in wait this season.
"We're delighted to welcome him into the squad at a time when (left-backs) Yun (Suk-Young) and Armand (Traore) are both sidelined through injury. He'll add great competition."
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