Sheffield United's Oliver McBurnie (R) reacts after a FA Cup sixth round loss to Arsenal. Arsenal needed an injury-time goal from Dani Ceballos to see them through while Ross Barkley scored the only goal for Chelsea at the King Power Stadium.
Arsenal progressed to the last four thanks to a late victor against Sheffield United on Sunday, with Dani Ceballos popping up with the decisive goal after Nicolas Pepe's first-half penalty was cancelled out by a David McGoldrick goal.
Pep Guardiola's team are looking to defend their crown, having beaten Watford in the decider a year ago, but Arsenal are the FA Cup's most successful team, having won it 13 times in their history.
Odion Ighalo had given United the lead before Todd Cantwell levelled to send the game into extra-time but Harry Maguire scored in the 118th minute to send Man Utd into the semi-finals where they'll now meet Chelsea in the last four.