Once one of the most feared strikers in Europe, Shevchenko's career hurtled downhill during a dreadful spell at Chelsea and he did not improve on returning to AC Milan for a season on loan.
However, it does appear his arrival back in Kiev two years ago has triggered a change in desire for the 34-year-old former Ukraine skipper.
Shevchenko scored the opener in his side's 2-0 victory over City a week ago and is clearly now a man the Blues have to watch very carefully if they are to stand a chance of reaching the last eight.
"Shevchenko seemed to be leading by example," said Kompany.
"He was not just captain because of what he achieved in the past, he was one of the best players in their team."