Porto boss Sergio Conceicao is more fearful of Chelsea after they lost to West Brom.
The Blues were stunned by relegation candidates West Brom at the weekend and fell to a 5-2 defeat at Stamford Bridge.
Next up, they face Porto in the quarter-finals of the Champions League – with the first leg taking place in Spain on Wednesday.
“You know that Thiago Silva was sent off in the first-half [agasint West Brom] and that the game had a different course,” said Conceicao.
“Chelsea until this last game had been extremely competent, they have not lost a game in the Champions League, they have the second best defence in the Champions League and also in the Premier League.
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“It is a competent team, and when these defeats happen it serves as a warning. If you want my opinion, I would prefer that they won the last game.
“Because these situations make the siren sound and everyone more alert, more awake to danger, and I honestly don’t like these defeats very much.”
Porto will take on Chelsea without their suspended two top goalscorers, Sergio Oliveira and Mehdi Taremi, for Wednesday’s last-eight first leg in Seville.