But Guardiola believes skill will win the game at Stamford Bridge tonight.
Guardiola warned: “All the Chelsea team are a danger.
“They can play in many different ways and they are tactically very flexible.
“Didier Drogba is very strong, the whole team harries for the ball and they know how to win it back.
“They are one of the most physical sides in Europe but also play at a very high level.”
Barca come of a 6-2 victory over rivals Real Madrid at the weekend.
Guardiola added: “We must reproduce the concentration we showed on Saturday, that’s the first step to ensure we make the final.
“It’s no good us trying to take them on head on, they are physically stronger and bigger than us.
“We have to know how to read the game and play to win -attack, keep possession, go for goal – that’s how we will reach Rome.”
