"It's going to be the game of the season," Herrera told the club's website. "I don't know the 'winner takes all' expression but it's going to be a massive game.
"If one of us wins it, we are not going to lose a lot of games or make mistakes after that. It will be key.
"We are in a very good moment, on a very good run... and we have to show it on Thursday."
United can also qualify for the Champions League by winning the Europa League. They play Spanish side Celta Vigo in the semi-finals next month.
"We also have the Europa League, which is a competition that makes me very excited... Hopefully we can fight for that title as well, but I know Celta Vigo are very good. They are a very difficult team," Herrera said.
United lost the league fixture at Old Trafford against City earlier in the season.
(Reporting by Aditi Prakash in Bengaluru; editing by Sudipto Ganguly)
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