The Spain international scored the Blues’ second in a 3-1 Club World Cup win over Monterrey in Yokohama after two-goal hauls against Nordsjaelland and Sunderland.
Torres has struggled to find any sort of consistent goal-scoring form since swapping Liverpool for Stamford Bridge in January 2011.
But Mata insists he always felt his international team-mate was close to recapturing his best form and says the Chelsea team “have a lot of confidence” in the forward.
“This is what I saw from him in training all those weeks and months, so I knew it would happen,” Mata said.
“And when I said I could see it coming, that was true. Fernando was, is and will be always an important player.
“He is a very good striker for us. Now you can see he is fully fit and we have a lot of confidence in him.”
Rafael Benitez’s Chelsea take on Brazilian side Corinthians in Sunday’s Club World Cup final.
MORE: Man United latest news
MORE: Arsenal latest news
MORE: Chelsea latest news
MORE: Liverpool latest news