Rookie Derby chief Lamps had a trophy-laden spell at Chelsea under the Special One.
And last night’s penalty shootout win was just as special for the Championship side’s new manager.
Phil Jones’ dismal effort saw United crash after a marathon shootout.
But Derby deserved to win this third-round tie in normal time after Jack Marriott’s header put them 2-1 up on 85 minutes.
The rested Paul Pogba had already left the ground when a Marouane Fellaini header five minutes into injury time took the tie to penalties.
United had started well enough, scoring after just three minutes through a cracking move. Ashley Young released Anthony Martial down the right and when he crossed Romelu Lukaku flicked the ball on for Jesse Lingard to set up Juan Mata for a sweet finish.
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Derby were full of ambition and came desperately close to equalising in the 53rd minute, but Sergio Romero pulled out a stunning save to stop Harry Wilson’s shot.
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