Manchester United finished eighth in the Premier League -- their lowest final position since 1990 -- and failed even to make it out of the Champions League group stage.
Mark Robins believes United's problems are overblown and they remain "the biggest club in the world".
Cole Palmer scored twice deep into stoppage time to complete a hat-trick as Chelsea stunned Manchester United 4-3 on Thursday.
In order to go through Manchester United must now beat Bayern at home next month and hope Copenhagen and Galatasaray draw.
Manchester United kept the critics at bay as they cruised into the League Cup fourth round with a 3-0 win against Crystal Palace on Tuesday.
Declan Rice scored his first goal for Arsenal and Gabriel Jesus added the icing on the cake as Arsenal roared back from a goal down to beat Manchester United 3-1 at the Emirates on Sunday
Alejandro Garnacho has vowed to come back "stronger than ever" after being ruled out for Manchester United and world champions Argentina due to an injury suffered against Southampton on Sunday