Leicester City's Danny Drinkwater is a shock £30million January transfer target for Manchester United coach Jose Mourinho.
Mourinho labelled that sorry sequence as a bad week but accused "Einsteins" of trying to "delete" his track record and United's history.
Holders City, who have won two of the last three League Cups, took the lead through Gael Clichy four minutes after half-time and made the tie safe when 19-year-old Aleix Garcia found the net midway through the second half.
The former Chelsea manager is facing a mini crisis at Old Trafford after losing three games in a week to Manchester City, Feyenoord and Watford but he believes it is because his players are still struggling to get over Van Gaal's reign.
"We had a bad week".
Wayne Rooney has always been a vocal force in the dressing room but the United captain is understood to feel under huge pressure after a disappointing start to the season and is anxious about his place in the team against Leicester after a dismal showing at Watford.
"I know that some football Einsteins - football is full of Einsteins - I know that they tried to delete 16 years of my career", the United boss told MUTV. "But that's the new football, it's full of Einsteins". The Liverpudlian midfielder only received a yellow card but Mourinho insisted he deserved red. While the chances of a raft of untried youngsters coming into the first-team seem slim, there are two who stand a real chance of earning some game time tonight. "He's won titles since but I think he has lost the plot". But I should just wait. "I'm not speaking about the penalty against Man City, I'm speaking about the situation that could have an important injury and, even in this kind of situation, I should stop and live with you, somehow that's dishonest".