The Etihad Stadium
City attracted a crowd of just 30,270 for their re-scheduled tie against Borussia Monchengladbach on Wednesday night - a game they won 4-0.
The club's fans have a bitter grudge against UEFA and can often be heard booing the famous Champions League anthem before games.
The Blues fans have various grievances with the competition organisers including a lack of action against Porto and CSKA Moscow after Mario Balotelli and Yaya Toure were racially abused during European matches against the sides.
City were also handed a conditional £49 million fine by UEFA for breaking their Financial Fair Play rules.
Then manager Manuel Pellegrini also had a restriction imposed on his Champions League squad from 25 players to 21, as well as caps on maximum losses, wages and transfer spending.
Manchester City manager Pep Guardiola
Swathes of empty seats around the Etihad prompted City legends like Francis Lee to call for fans to bury the hatchet while new boss Pep Guardiola also urged the club's supporters to attend future matches - as reported by the Independent.
A younger Jack Sullivan (centre) alongside dad and Hammers co-owner David
He said: "City's stadium is half full for a Champions League game!!! I know it's on the wrong day but IT'S CHAMPIONS LEAGUE."
He also later retweeted a post comparing City's attendance to that of West Ham's Europa League third qualifying round home game against Slovenian minnows Domzale where nearly 25,000 more supporters attended the Olympic Stadium.
City's stadium is half full for a champions league game!!! I know it's on the wrong day but ITS CHAMPIONS LEAGUE— Jack Sullivan (@jsullivanwhu) September 14, 2016
Attendances:— West Ham Transfers (@westhamtransfer) September 15, 2016
Man City v Borussia Mönchengladbach = 30,217
West Ham v Domzale = 54,000 pic.twitter.com/B1J6qqVDjB
While Sullivan was merely saying what a lot of football fans were thinking, the Hammers have their own stadium problems at the moment.
They moved into their new home this summer but will not be given the licence for the full 66,000 capacity until the club can ensure supporters are not persistently standing during matches.
Match stewards attempt to make West Ham United fans sit down
At the moment capacity is capped at 57,000 meaning few if any tickets can go on general sale to supporters given the East Londoners have 52,000 season ticket holders - second only to Manchester United in the Premier League.
Issues over standing and segregation have led to ugly scenes breaking out between West Ham supporters and with rival fans in the opening games at what is being called London Stadium.