Di Matteo has transformed the fortunes of the Blues since being appointed caretaker manager just over six weeks ago, culminating in Sunday's 5-1 FA Cup semi-final thrashing of Tottenham.
But the 41-year-old had no illusions Chelsea would need to hit new heights on Wednesday and next Tuesday to beat the team some regard as one of the greatest of all time.
'It's fair to say we need two perfect games,' Di Matteo said. 'But I think, also, that the fact we've been performing very well in the last six weeks gives us the belief we can produce two perfect games in this match.
'It's the biggest challenge for any manager to play against the best team in the world, but for every player as well, to be able to compare themselves against one of the top teams in the world.'
More to follow.