Follow live: Champions Man City face road test at Newcastle
Brought on by Pep Guardiola with City trailing 2-1, Kevin De Bruyne scored one and made a 91st-minute winner for fellow sub Oscar Bobb as the Premier League champions won a thriller.
Jose Mourinho has opened the door to one day managing Celtic or Rangers, saying buoyant matchday atmospheres could entice him to the Scottish Premiership.