Alexis Sanchez's scrambled extra-time winner secured Arsenal an FA Cup final date with Chelsea - and ensured Manchester City manager Pep Guardiola will end a season without a trophy for the first time in his coaching career.
Arsenal kept alive their hopes of finishing in the top four of the Premier League with a narrow victory at second-bottom Middlesbrough.
Ten-man Arsenal were knocked out of the Champions League at the last-16 stage for the seventh successive season following a second-half capitulation against Bayern Munich.
Arsenal avoided an FA Cup giant-killing and spared manager Arsene Wenger further pressure with a hard-fought fifth-round victory over non-league Sutton United at Gander Green Lane.
England striker and Arsenal target Jamie Vardy has agreed a new deal with Premier League champions Leicester.
Manchester United boss Louis van Gaal says he is unfazed by Pep Guardiola's desire to manage in the Premier League.
Arsenal manager Arsene Wenger is confident striker Danny Welbeck will continue to improve his finishing after his hat-trick against Galatasaray in the Champions League.