Bereft of a cutting edge up front or creativity in midfield without the injured Paul Pogba, United won thanks to solid defending and a freak Marcus Rashford goal.
United are just two points adrift of City in the Premier League table, but have conceded two fewer goals, while it's a similar story in Europe, with their defence only being breached once as CSKA Moscow netted a consolation goal earlier this month.
"I knew how good he was and I told the players how good he was", Mourinho said to BT Sport.
Mourinho instructed his players to put pressure on the stopper, who only turned 18 in August, from set pieces in the hope that he would make an error which might prove so very crucial.
"Phil Jones was on the bench because he felt that if we really needed him, he could [play]", the manager said.
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"Manchester United are more than titles", said Bellamy.
Manchester United have started this season very well, and one of the reasons why may be down to the acquisition of Nemanja Matic.
"I knew how good the goalkeeper was, I told the players that". "As a club, they have a certain way of playing and, as a club, they've let that go for the time being".
The Red Devils managed a 1-0 victory over Benfica on Wednesday, making it three wins from three games to open up Group A and open up a three-point lead on Basel atop the group.
The former Welsh global, who was speaking as a pundit on Sky Sports, believes that the Red Devils are losing their identity under the pragmatic Portuguese.
Keane believes "the clean sheets will allow United to build foundations to get trophies", while Scholes feels that it is acceptable for United to play cautiously now because "they haven't been in a position to win the league".