Andre Villas-Boas is confident Chelsea are capable of beating Barcelona and says he would quit if he did not feel his team could match the European champions.
Winning the UEFA Champions League has been a burning ambition of Blues owner Roman Abramovich, but the club have reached the final only once when losing on penalties to Manchester United in 2008.
In contrast, holders Barcelona have won the competition three times in six years and have bolstered their squad further by signing Alexis Sanchez and Cesc Fabregas this summer.
Barcelona are again favourites to be crowned Europe's best, but new Chelsea boss Villas-Boas would have no fears about pitting his wits against one of the best club sides of all time.
"Barcelona are the reference," said Villas-Boas.
"They can beat any team in the world, but so could Chelsea and so could Real (Madrid).
"If I didn't believe that, I'd quit the game. I'm not going into the game with a losing mentality."
Chelsea managed to get the better of Barca more than once while Villas-Boas was part of Jose Mourinho's backroom team, while Mourinho's Inter Milan also beat them two seasons ago.
And Villas-Boas pointed out the competition was littered with upsets, including when he helped Porto triumph in 2004.
"That's what happened with Porto and Monaco," he said.
"Porto put out Deportivo and Lyon, and (Manchester) United in the last 16. Monaco put out Chelsea and Real Madrid.
"It's pretty unpredictable. There's a pattern over the last four years with more or less the same teams present in the semi-finals, but it depends on the draw up to then."
Which club has the best draw in the Champions League?