The Chile international penned a year-long deal at Loftus Road in the last transfer window after finding himself surplus to requirements at Juventus.
Isla initially struggled for form at QPR, as Harry Redknapp's men made a sluggish start in the Premier League, leading to suggestions he would look to move back to Serie A.
However, the 26-year-old put in a much improved showing as QPR defeated Aston Villa 2-0 on Monday and he insists he is committed to the club.
"That [going back to Italy] was never going to happen," he told the London Evening Standard.
"People talk but I've never spoken about it. I've not spoken to a single director at Juventus since I came to England, not even to the coach there, Massimiliano Allegri.
"It is important for me to stay here a long while because I need to get match fitness back after the cruciate knee ligament injury I had [while playing for Udinese in 2012].
"After playing so many games for Udinese, it was a bit of a sad situation at Juventus.
"Because of the injury and other reasons, I didn't play all that much for Juve. On the other hand, I'm playing regularly here, so I'm really happy about it."
Get the best features, fun and footballing frolics straight to your inbox every week.
Thank you for signing up to Four Four Two. You will receive a verification email shortly.
There was a problem. Please refresh the page and try again.