Chelsea coach Jose Mourinho admitted that striker Andriy Shevchenko is showing steady improvement. "I think it is a natural evolution, especially for a striker. It is not easy for a striker in this country, they need time to adapt, but Andrei is improving," Mourinho told Sky Sports News on Saturday. The Ukrainian striker, who has not been at his best since arriving at Stamford Bridge in the off season, scored the opener for Chelsea in the 3-0 win over Sheffield United on Saturday. The Portuguese manager compared Sheva's situation to that of his strike-partner Didier Drogba. "It is a bit like Didier (Drogba). Second season better than first season, third season better than second season,” said Mourinho.