Torres has now scored seven goals since Di Matteo replaced the sacked Andre Villas-Boas eight weeks ago, more than double he managed for Chelsea before then.
Asked what had changed at the club, he said: "We understood that we needed to play as a team.
"We wanted to get away from the difficult situation we went through. It's been a very difficult season for us. We changed the manager in the middle of the season.
"The beginning was not the best, so we needed to talk and we need to think that we could achieve good things. But we needed to be a team and I think that's exactly what we are showing now.
"We did it in the Champions League, we are doing it in the league, we are in the FA Cup final, so it can be a great season.
"But still, we have to work, or it can be a very bad season as well."