Prolific in Serie A with AC Milan, Shevchenko has scored only three league goals since moving to Stamford Bridge for 30 million pounds (58.83 million dollars) in the close-season, sparking speculation about his future at the champions.

"I know why my performances haven't been what I want and I am working hard to put it right," the Ukraine captain told reporters at Chelsea's training ground.

"It's difficult coming to a new country. When you have played for seven years in Milan and you have got used to the culture, the way of life and the language it's normal that there are problems when you change," he said.

"But I like living in London and I am feeling good now."

Shevchenko, who scored against Levski Sofia in the Champions League in midweek, said he had faced similar challenges when he first arrived in Milan from Dynamo Kiev in 1999.

"I didn't get it easy at Milan," said the 30-year-old. "I had difficult times and I earned my respect -- and the confidence of the manager. What I'm doing here is the same.

"When I am really at my top level I will have no problems at all."

Chelsea manager Jose Mourinho named nine players this week he considered "untouchable" in terms of team selection. Shevchenko, one of the first names on a Milan team sheet, did not make the list.

The striker said, however, he had a good relationship with the Portuguese coach who has guided Chelsea to two consecutive league titles.

"I've got no doubts that when I'm in my best form I will play. Everyone in the team is helping me. And I spoke a lot to Jose. It's a good feeling between us," he said.

Shevchenko also discounted any suggestion that he might be considering a return to Italy.