Atletico Madrid midfielder Diego says they must not underestimate Champions League opponents Chelsea.
Chelsea go into the Champions League semifinal first-leg on the back of a home defeat to Sunderland.
Diego said, "They are a very compact, focused team. They have a vastly experienced squad and coach who know what it takes in this competition. They can score against you in a flash when they win the ball back. That's one of their strengths.
The playmaker doesn't believe Saturday's loss to Sunderland will affect the Blues: "It's a different competition. It will be a special match on Tuesday. Everyone will be really up for it and focused, so it will be a very tough game."
