Kompany will be in the line-up for City's massive Champions League clash at Ajax.
The Belgian responded tartly on Tuesday to suggestions he has been struggling.
"I am on top of my form and feel great," he said without a smile.
Anyone who has seen him play recently knows differently, of course, and even Mancini has acknowledged privately that Kompany has not been at his best.
"I can't say I won't make any more mistakes in my career because I will," added Kompany.
"But I am happy with the way I am playing."