Bulgaria international Martin Petrov has expressed his disappointment at being dropped to the substitute's bench for Monday's 1-1 draw at Aston Villa.
The 30-year-old had been outstanding in City's previous game - the 3-1 victory against West Ham United - which had been his first start of the season.
But he said of his failure to keep his place in Mark Hughes' starting 11: "When they give me a chance I give my best. I think I've shown that I deserve a place in the starting line-up but it's up to the manager.
"It's not pleasant. I'm a professional and I'm observing my obligations but it doesn't rest well with me."
Petrov was linked with a move away from Eastlands in the summer following Hughes' massive spending spree but no transfer materialised.
He was a regular starter in his first season with City following his switch from Atletico Madrid but spent most of the 2008-09 campaign on the bench.