City ran away with the title, claiming the crown with five matches to spare and running out 19 points clear of the Red Devils, who finished second.
He believes it is entirely possible that United can bridge the gap next term – and not just because he is confident that they will improve.
“I think this season was an exception,” he told the Telegraph. “I don’t think the Premier League is going to be like it was this season. Next season I think the champion can be champion with 85, 86 points.
“I think this season was an exception. City won six or seven games in the last minutes. I remember West Ham at home, Huddersfield away, Southampton, Bournemouth.
"If they draw all those games, maybe the champions would be seven or eight points less. I don’t think next season the champions will be again that far from the second.”
Meanwhile, he admits that he is envious to see City and Liverpool - who will contest the Champions League final against Real Madrid next weekend - enjoy such success.
“If any player in the world tells you he doesn’t care about what the opponents do he is lying to you,” the Spaniard said.
“I cannot lie to you - if I could choose at the beginning of the season who wins the Premier League and who wins the Champions League, if we couldn’t be champions, I wouldn’t tell you Manchester City and Liverpool.
"I respect them - I have never hated anyone - but I cannot lie.”
Herrera will have his opportunity to get hold of some silverware on Saturday, when Jose Mourinho’s side tackle Chelsea in the FA Cup final - evidence, he says, of the improving fortunes of the Old Trafford club.