Chelsea manager Jose Mourinho believes his side will have to be at their best if they want to reach the quarter-finals of the Champions League after the Blues were drawn against FC Porto in the last 16 of the competition.
Mourinho guided the Portuguese side to success in the 2004 Champions League but he left the club to join Chelsea after their Final success against AS Monaco.
He is looking forward to pitting his wits against his former side, telling the Blues' official website: "A draw is a draw and especially in the last 16 of the Champions League you know a good team is coming your way.
"Porto is a team with tradition in European football and is a team with ambition so they deserve respect from us and they will have it.
"Do we want to go to the quarter-final? Of course. Are we confident? 100 per cent.
"But I repeat only a good Chelsea playing at a high level will do it.
"It is two months to the first leg so it is time to forget the Champions League and concentrate on domestic competitions."