Chelsea boss Phil Scolari says Andriy Shevchenko must overcome his complex if he is to succeed in England.
He said: "Sheva has not achieved great things at Chelsea as it was so hard for him to move from Milan.
"We have seen many times in the past that he is a great talent.
"But he must overcome these problems, which are mostly psychological, to achieve at Chelsea."
Shevchenko missed the decisive spotkick in last night's shootout defeat against Lokomotiv Moscow and Scolari added: "One penalty has not changed my view of Shevchenko.
"It was not his mistake, it was mine. I said I would choose the penalty takers.
"We need to improve shootouts but I'm not too worried."