Luigi De Canio was at a loss to explain QPR's below-par display after the 3-1 defeat to Cardiff City.
A brace from Joe Ledley and a Paul Parry goal put the Bluebirds in control, and although Patrick Agyemang pulled one back for the R's late on, a 3-1 defeat flattered Rangers.
"I'm very disappointed. We could and we should have played a better game," De Canio told www.qpr.co.uk.
"We simply got it wrong on the night. We didn't have the right attention on the pitch, or the right determination.
"It was not the real QPR out there, but credit to Cardiff. They really surprised us and took full advantage of our mistakes.
"The first goal was a very disappointing one to concede and we never recovered."
To compound Rangers woes, Fitz Hall and Matthew Connolly both limped off with injuries in the first half. De Canio added: "We will assess the injuries in the morning, but at this stage they look like they could be serious.
"The two injuries summed up our night, but we need to re-group ahead of the match against Bristol City on Saturday."
