In the 87th minute Sheffield United equalised through David McGoldrick who pounced on a poor clearance by the Arsenal defence off a long throw.
The draw for the semi-finals of the FA Cup has been conducted this evening and the London and Manchester clubs have been kept apart.More news: Kayleigh McEnany Goes After New York Times for Russia Report
The semi-finals will be played at Wembley and will take place across the weekend of July 18-19.
Sheffield United's Oliver McBurnie (R) reacts after a FA Cup sixth round loss to Arsenal.
Harry Maguire scored a late victor for the Red Devils against the Canaries, while Dani Ceballos did the same for Arsenal to sink Sheffield United. So unless the Magpies can turn things around in the second half, City will be heading to Wembley to face Arsenal. United defender John Egan's header early in the second half was also chalked off.More news: Interpreting Prime Minister Narendra Modi’s Statement on China
The draw was made at half-time in the game between City and Newcastle, which Pep Guardiola's side won 2-0 thanks to a Kevin de Bruyne penalty and a classy Raheem Sterling finish.
The win means Arsenal have now qualified for the FA Cup semi-final for the 30th time, equaling the feat first achieved by Manchester United when they beat Norwich City 2-1 on Saturday.
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Southampton moved up one place to 13th and is a comfortable 13 points clear of the relegation zone.