Pep Guardiola refused to apologise for his comments about Manchester City's support in midweek.
The City manager invited the club's fans to turn up in their droves for Saturday's clash with Southampton after recording a 6-3 victory over RB Leipzig in front of 38,062 at the Etihad Stadium.
Kevin Parker, general secretary of City's supporters' club, criticised Guardiola for being out of touch but the Catalan stood his ground.
'Mr Parker should review the comments. I will not apologise,' Guardiola said.
'Did I say after the game that I was disappointed because the stadium was not full? Interpretation is interpretation. I'm not going to apologise. I am surprised at what has happened [since].
'When you play in the Champions League it is so tough, knowing that Southampton have had all week to prepare. I make an approach to do something together again.
'What I said is we would love the support, we need the support – 40,000 or 50,000 people.