Paul Pogba's cavalier performance in the Manchester derby was behind United's defeat by arch rivals City on Saturday, according to Sportsmail columnist Jamie Carragher.
In the first Premier League meeting between Jose Mourinho and Pep Guardiola the Spaniard claimed local bragging rights with a 2-1 victory at Old Trafford courtesy of first half goals from Kevin De Bruyne and Kelechi Iheanacho.
Speaking on Sky's Monday Night Football, Carragher believes it was less Guardiola's tactical masterclass and more Pogba's poor discipline that cost United.