Cech has lauded Messi and his Barcelona team-mates, but believes Chelsea can triumph in their Champions League semi-final, the first leg of which is at Stamford Bridge on Wednesday.
Cech told his personal website: "Barcelona alone are an exceptional team with a fantastic generation of players and he is the most exceptional among the exceptional. He is even better than the rest.
"Messi in his current form is an enormous threat. He is for sure one of the best players in the world but, as I said before, no team is invincible.
"His ball technique is superb but, most importantly, he can react to how the game develops. At the last possible moment in any situation he can find the ideal solution. There are a lot of ways that Messi can finish an attack.
"On the other hand, he is also only human and, if we perform to 100%, we will be able to defend against him."
Cech has also admitted Pep Guardiola's side go into the semi-final as favourites, but wants Chelsea to upset the odds.
He said: "They are the biggest favourites of the Champions League, they are defending the trophy but anything can happen.
"We have two matches in which we can overturn the prognosis about favourites."