Visiting City will travel to Old Trafford holding a two-point advantage over their neighbours at the top of the Premier League.
However, the Danish keeper has claimed that the presence of Chelsea in third position means that Sunday's result will not be decisive.
"Four games ago I would have said it will be between City and United," said the 27-year-old.
"But Chelsea seem to be going well as well so you can't say it is just about United and City now. It is too early."
Lindegaard, who is normally the back-up keeper for the Red Devils, started yesterday's win over Otelul Galati.