He wrote: "Honoured to have played with Craig Bellamy from his time at city. Great pro in training and class player! Good luck in the next chapter."
With Richards's own long-term future being up in the air, one Twitter user opted to cheekily ask when the defender will be retiring.
In response, Richards said: "When u start puberty."
@nanikhan90 when u start puberty 😛😛😛— Micah Richards (@MicahRichards) May 22, 2014