Mark Warburton has branded former Rangers captain Lee Wallace as sloppy after the left back gave away two penalties for QPR.
The Ibrox hero had a night to forget as his side lost 2-0, with both goals coming from the penalty spot after fouls by Wallace.
Former Celtic star Scott Sinclair netted one while the other was scored by Rangers' summer target Daniel Johnson as Preston took all three points.
And Warburton admits he's frustrated by the 'sloppy' defending that led to the first foul and was even more disappointed by the second after the ball was allowed to bounce in the QPR box.
He said: “The preparation was good, we had the extra day – Wednesday as opposed to Tuesday – the players trained well, the focus was good and analysis was good.
“We were very confident. The way we started supported that. But the intensity dipped out of the game. We have to react better to a negative.
“There’s no excuses – we gave away a really sloppy penalty. It shouldn’t happen, simple as that.
“It knocked the wind out of their sails and I don’t know why. We had a few words at half-time but again we’ve given away a penalty where the ball’s travelled 80 yards in the air and we’ve just got to make first contact and pick up second ball.
“Once you’ve let it bounce in your area – all sorts of problems. Lee’s adamant he pulled his foot away and the guy’s gone down. Well if he’s clever, he’s clever – he’s got his rewards.
“The fact is we allowed it to happen and we didn’t show enough quality. Albert [Adomah] was devastated at the end that he didn’t score – that would have made it 1-1.
“It’s very frustrating. If a team cuts you open with quality you say fair enough – but we’ve given away two awful penalties that were easily avoidable.
“We’ve dropped three valuable points.”
