Kompany was withdrawn at half-time of Sunday's derby defeat and it appears as though he set to undergo a scan that could in all likelihood determine the course of the remainder of his season.
The Telegraph is reporting that he could be done for 3-4 weeks with the thigh injury the latest in a series of muscle injuries that have afflicted him:
City have yet to make a clear assessment of the extent of Kompany's injury, however, with the club's medical team choosing to allow the thigh muscle to settle before scanning the affected area.
If scans confirm that Kompany faces a month on the sidelines, the defender faces being ruled out until the final game of City's season against Southampton at the Etihad Stadium on May 24.
But with Kompany suspended for Belgium's Euro 2016 qualifier against Wales in Cardiff in June, City may yet to decide to diagnose a prolonged period of rest for the player in order to avoid the risk of further setbacks.
If the diagnosis is around a month or so this realistically puts an end to his season, with the sensible option being to shut down his season and ensure he returns fully fit for the start of 2015/16. The concern for City still of course is there battle to a) ensure they finish in the top four, and b) to still try and catch United and/or Arsenal to avoid a Champions League playoff.
Should we not see Kompany again this season it would at least open the door for Eliaquim Mangala to get a sustained run of games - something that he has barely had in a disappointing season - to try and build some confidence for next season where the reality is that the club need him to be first choice alongside Kompany.