Czech outfit confident of upsetting the Blues.
Chelsea take on Sparta Prague in the first leg of their round-of-32 Europa League tie on Thursday night.
The London club dropped into this competition after finishing third in their Champions League group, and Lavicka concedes his team are the underdogs.
“We are not in the favourites of this match,” said Sparta coach Vitezslav Lavicka in his pre-match press conference.
“But the matches we played in autumn against the big European teams revealed that we are able to compete with them. We only need to be courageous and disciplined.”
Chelsea captain John Terry has travelled to the Czech Republic, despite missing the 4-1 league win over Wigan on Saturday (February 9) with a knee injury.
Blues’ goalkeeper Petr Cech has a hairline fracture to his little finger on his left hand, meanwhile, but should still play against his former club.