Having won seven games in succession between November and December, Leeds have now savoured victory in just four of their last 10 league games - five of which have ended in defeat.
Ebere Eze and Mateusz Klich chase the ball during "Queens Park Rangers" win over Leeds United.
They would have returned to the summit of the second tier had they beaten Rangers.
Having dominated most of the first half, the visitors were undone three minutes into the second.
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Senator Chuck Grassley watches as Jared Kushner speaks with Donald Trump during a signing ceremony on December 21, 2018. Kelly, a former general and Homeland Security Secretary, resigned as chief of staff at the end of a year ago .
"We are confident in our own ability and our team spirit and we know we have got enough in that dressing room to get us over the line", said Cooper.
"I thought we started well and then they pinned us back".
"We fought for each other tonight and that was the key thing".
"With the FA Cup run I think that's our eighth game in 24 days, we were anxious about fatigue and not enough time on the training ground, and after Saturday I thought it's going to take an almighty effort to win this game". But you work hard for that and we worked hard for that tonight, for that clean sheet. Leeds were in the ascendancy at the time and Cooper admitted the injury came at the worst possible moment.
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"We just said we stay calm, don't panic, it will turn, you'll get the luck".
On the pitch, the opportunity to do just that now presents itself just 72 hours after the Rangers defeat and Cooper says his men will be striving for the ideal response against West Brom.
"All games are important but we can't hide the points we lost".
"We've been going through results that have been undeserved". It's back to the drawing board and we will be working hard again for a big game on Friday.
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