Porto boss Esualdo Ferreira has promised his side will stay loyal to their footballing 'principles' when former coach Jose Mourinho pits his Chelsea superstars against his old team tonight.
Porto warmed up for the visit of the English champions with a 4-0 victory over Naval at the weekend but Ferreira knows Mourinho's multi-million pound squad will present them with much bigger problems.
Yet the Porto coach is adamant his side have the desire to overcome the Blues in the first leg of their Champions League last 16 tie as Mourinho returns to the club he led to the Champions League crown three years ago.
Ferreira said: 'We have our way of playing and our system. The adversary can only force us to adapt to the way they play at certain key moments in the game but they will never make us change our principles. I believe we are equal to our adversary.
'We will go into this game with a very strong desire to win, above everything else. Nothing else matters to my players. Everybody in my squad wants to play and the team want to win.'
Ferreira urged the fans who once idolised Mourinho when he led them to the Champions League title, to get behind his side from the start.
He added: 'We are waiting for our fans to applaud and get behind us from the first minute to the last. I want a constant support from those fans, from the moment we come on for the warm-up.
'If so, that may sustain us and make our ambitions greater. We want a spectacular game. What is basic is that we get two results over these matches that take us through to the next round.
'Playing the first game at home means it is basic that we want to win. We want to construct the first stage in a victory over two legs. Winning the home game would be the best result for us but it would not determine the outcome of the tie.
'What does that is the whole tie over two games and the adversary is strong because it has shown itself to be a strong team and a strong collective over the past three years.'