Lewis Grabban's goal seven minutes from time saw Nottingham Forest dump Arsenal out of the FA Cup in the third-round for the second time in four years.
There was little goalmouth action in the tie and Mikel Arteta is sure to be angry at his side's lacklustre display.
Still, Arsenal would have been in front at this point if Eddie Nketiah had headed home Bukayo Saka's cross just before the hour mark rather than float his free header at ninety degrees to the goal.
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Lewis Grabban's goal seven minutes from time saw Nottingham Forest dump Arsenal out of the FA Cup in the third-round for the second time in four years.
There was little goalmouth action in the tie and Mikel Arteta is sure to be angry at his side's lacklustre display.
Still, Arsenal would have been in front at this point if Eddie Nketiah had headed home Bukayo Saka's cross just before the hour mark rather than float his free header at ninety degrees to the goal.
The fourth round will be played between 4 and 7 February.
Draw in full
Crystal Palace v Hartlepool United
Bournemouth v Boreham Wood
Huddersfield Town v Barnsley
Peterborough United v Queens Park Rangers
Cambridge United v Luton Town
Southampton v Coventry City
Chelsea v Plymouth Argyle
Everton v Brentford
Kidderminster Harriers v West Ham United
Manchester United/Aston Villa v Middlesbrough
Tottenham Hotspur v Brighton and Hove Albion
Liverpool v Cardiff City
Stoke City v Wigan Athletic
Nottingham Forest v Leicester City
Manchester City v Fulham
Wolverhampton Wanderers v Norwich City