Posh were effectively beaten in the opening seven minutes at the John Smith’s Stadium after conceding two goals. The hosts added a third goal from a corner - their second set-piece goal of the night - 20 minutes from time.
Posh are eight points from safety, but could fall further behind today (Saturday) depending on Reading’s result at home to Millwall.
“That start killed us,” Posh winger Joe Ward admitted. “We just couldn’t get back into the game after that.
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“We should have taken confidence from the way we played against Manchester City into last night’s game. We should have been feeling good, but we were out of the game very quickly.
“It was disappointing to concede from set-pieces again. We need to put our bodies on the line and do all we can to stop our opponent scoring.
“It’s gone now though. Games are coming thick and fast and we must take the anger and disappointment from this game ino our next one and fight for the points.”