Nigel de Jong, Vincent? Kompany and Micah Richards are unhappy with the new deals offered to them, especially after learning that City are paying club record signing Aguero ?200,000 per week in a five-year deal confirmed.
Holland midfielder De Jong revealed how he had already grown 'frustrated' at the way contract negotiations had progressed and it has since emerged that talks have broken down.
City slicker: Man City's record signing will wear the No 16 shirt after his ?38m move
De Jong, a star performer in manager Roberto Mancini's midfield last season alongside Yaya Toure, who earns ?200,000 a week, was believed to have been offered ?80,000 a week.
Kompany and Richards also feel undervalued by their? big-spending club.
Richards has been offered a five-yeardeal worth ?65,000 a week while Kompany has been told to expect a four-year deal worth ?80,000 a week. However, the pair are mulling over the offers.
Full back Richards has publicly stated his desire to stay at the club and rejected claims he was looking for ?100,000 a week.
Kompany, who was in last season's PFAteam of the year and is City's player of the year, is a candidate to skipper the side if Carlos Tevez leaves.
Unhappy chappy: Nigel de Jong, Micah Richards and Vincent Kompany are said to be angry at Aguero's wages
But Kompany and Richards will hold out for deals they feel represent their standing as important first-team regulars.
City are keen to rein in their spending over the coming seasons and cutting wages is part of their efficiency drive.
But the fact they have agreed to pay Aguero ?52m in wages over five years has not been lost on De Jong, Kompany and Richards.
A City source said: 'While efforts tobring the club's wage bill into line are commendable, it doesn't wash with the key members of the squad being offered less than half of what some of the top earners like Yaya Toure, Carlos Tevez and Sergio Aguero will earn.
Big money man: Yaya Toure is another of City's biggest earners, along with Carlos Tevez
'All the players are keen to stay and play their part in City's success, but they don't want to feel forgotten about.'
Argentina striker Aguero revealed words from his compatriot Pablo Zabaleta convinced him to join City.
Aguero, unaware his salary has causedsuch unrest, said: 'Zabaleta has told me all about City and it is very positive. He has told me that it is a happy squad and I have only heard good things about them.
More of the same: Aguero has backed Manchester City to build on last season's FA Cup triumph
'I have always wanted to play in the Premier League and this is a good club. I think we will be fighting every year to win major trophies.'
Atletico Madrid fans reacted badly to Aguero's departure, burning his shirt and chanting 'die, die' in the Europa League.
But the player is looking forward and not back as he tipped his new employers to contend for major honours in the near future.
Mancini's men ended the club's 35-year wait for a trophy by lifting the FA Cup in May and Aguero said: 'I saw the game (FA Cup final) and I think we are a team that in the future will be fighting every year to win major trophies. Let's hope that it's quite a few major trophies.'
Aguero does not reckon he will have any problems adapting to English football.
Worth the wait: But the City fans will be hoping it is not another 35 years before their next piece of silverware
'I think in terms of technique the leagues are similar. Maybe the game is more physical in England and there is a greater emphasis on tactics in Spain. From what I've seen on TV there is a high level of skill here.
'It is quite different but I need to wait for my first game, go out and do my best and find out for real what it's like, because playing is not the same as watching it on TV.
'My style has always been to fight to the death for every ball, and give 100 per cent in every game. I'm not a player who can do everything, but I still have plenty to offer. I don't think I'll have too many problems settling into the team.'Aguero becomes manager Mancini's third signing of the summer, following the arrivals of Arsenal defender Gael Clichy and Partizan Belgrade's Stefan Savic, and takes the Italian's spending in this window to ?48m.
?CLICK HERE TO SIGN UP FOR OUR FREE FANTASY FOOTBALL GAMEAguero targets trophies after securing dream move to Manchester CityAguero set to make Man City debut in Dublin after completing ?38m switchGame in Spain: Aguero will be motivated at City... even though he didn't want to leave Madrid!From ?2.50 a day to the new Diego: Aguero becomes City's new ?35m man
Source: Daily Mail
Source: Daily Mail