Manchester - Manchester City skipper Vincent Kompany described himself as "invincible" on Saturday despite seeing his latest injury comeback last just eight minutes.
The 29-year-old Belgian international came on as a second-half substitute in the 4-1 win over Sunderland after eight matches out with a calf injury.
But in the 70th minute, he had to come off.
"Today was a bad day for me. My body feels invincible -- the best it's ever been -- but I'm challenged by a number of small and local injuries," Kompany said in a message posted on his Facebook page.
"It leaves me more frustrated than with any of the 'big' injuries I've had but it's a challenge that I will overcome.
"I'm definitely not asking anyone to feel sorry for me and I hope you wouldn't anyway."
Kompany had come on in the 62nd minute at Eastlands on Saturday but his latest setback gave manager Manuel Pellegrini a worrying selection headache ahead of Tuesday's trip to title rivals Leicester.
But the iron-willed Belgian vowed to come back, fitter and stronger.
"I've made many sacrifices to get where I am today and football is everything to me. This is what I fought for so hard," he added.
"I want to be the best defender in the world and I want Manchester City FC and Belgium to become the best club and country in world football.
"I won't give up that dream. Injuries have and still are preventing me to play my role the way I'd want to but it's not stopping me progress. I will get on with it and when I do come back. I will be stronger again.
"My mindset stays unchanged, I will fight to get what I deserve, my best years in football."