Diego Simeone believes Chelsea's victory over Liverpool without several of their star men shows they can hurt his Atletico Madrid side on Wednesday.
The two clubs enter the second leg of their Champions League semi-final tie with the scores locked at 0-0 after a stalemate last Tuesday at the Vicente Calderon.
Simeone is under no illusions as to the task at hand for his troops and is anticiapting a tough clash at Stamford Bridge.
"It is clear Chelsea has a huge team because they won despite making a lot of changes," he said.
"That means we are going to play against a powerful team, something we knew. So they will make a lot of problems for us next Wednesday."
Atletico Madrid are looking to reach their first European Cup final since 1974, when they lost 4-0 to Bayern Munich in a replay at Heysel.