"Intensity for a goalkeeper is different," Klopp said.
"It's not a physical intensity, it's a mental intensity. We ... said we wanted to have three really strong goalkeepers, that's our situation now.
"That means you cannot deal with it like you do when you have a clear number three, a clear number two -- yes, Simon is a clear number one, but the others are not clear number twos and number threes, they are really strong goalkeepers."
Mignolet was handed the gloves at the start of the season, playing in Liverpool's 3-3 Premier League draw at Watford, the 1-0 home win over Crystal Palace and both legs of their 6-2 aggregate Champions League qualifying win over Hoffenheim.
The Belgian has been criticised over the past few seasons, particularly for his vulnerability under the high ball, but Klopp said he had earned his spot as first choice.
"He's a machine, he's always there, he's solid, really, really reliable ... so he won the race," the German added.
"One hundred percent if nothing happens, Simon will play against City."
Loris Karius came into the team and kept a clean sheet on Sunday, despite a few nervy moments when he dwelt on the ball too long and was nearly punished by Danny Welbeck.
Klopp hinted he would continue to rotate his goalkeepers.
"(Karius) had a lot of good things, he played really cool football, yes sometimes a little bit too cool and waited a little bit too long but ... we all need to learn and get used to playing football in close situations," Klopp added.
Liverpool travel to Manchester City on Sept. 9 when the league resumes after the international break.
(Writing by Simon Jennings in Bengaluru, editing by Nick Mulvenney)
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