Manchester United’s Belgian striker Romelu Lukaku celebrate after scoring against Derby. Getty Images

Manchester United left it late to beat Derby County 2-0 in an entertaining FA Cup third-round game at Old Trafford.

A replay looked on the cards until Romelu Lukaku laid the ball off to Jesse Lingard, who took a touch and sent a 20-yard shot on the bounce into the top corner.

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And half-time substitute Lukaku sealed the win after playing a one-two with Anthony Martial to cap off a counter attack.

United striker Marcus Rashford had hit the post in both halves – with a close-range header that he should have buried and a fierce shot across goal.

Rams keeper Scott Carson was excellent, making eight saves, including fine stops to keep out Juan Mata and Paul Pogba free-kicks.

Derby, second in the Championship, played well and Tom Lawrence forced a good diving save from Sergio Romero.