Kompany, who has been plagued by a variety of muscle injuries over the past 12 months, was originally expected to miss three weeks but has now been sidelined for five.
The Belgian FA team physio Lieven Messchalck was sent to assess the defender.
Messchalck suggests that Kompany is likely to be out for a further three weeks, bringing the total time out to around eight weeks, and will see him miss the Super Sunday game against Tottenham Hotspur on 24th November.
Lieven Messchalck: "I think Vincent is going to be ready in several weeks.
"We will do everything we can to bring back Vincent in a good way for a long time.
"First of all he had a rupture, a tear into the abductor and then also he has bad luck with a small thing on the front side now, so it's everything together.
"It's not really so long, eight weeks is nothing in the time of injury, you must respect biology."
Manchester City Fixtures
Sunday November 2413:30 Premier LeagueManchester City v Tottenham
Wednesday November 2719:45 Champions League - Group DManchester City v Plzen
Sunday December 116:10 Premier LeagueManchester City v Swansea City
Wednesday December 420:00 Premier LeagueWest Brom v Manchester City
Saturday December 715:00Premier LeagueSouthampton v Manchester City
Source: Manchester City MAD