Chelsea boss Andre Villas-Boas insists their FA Cup draw at Birmingham City won't influence preparations for Champions League opponents Napoli.

How could a side who failed to beat lower league opponents missing half of their first-choice line-up ever hope to handle one of Serie A's finest?

"Because it's football and it happens just like that when you least expect it," was Villas-Boas' reply.

"Napoli is a strong team but we are a strong team - we still believe."