Torres has made a good start to the season, scoring twice in three games and having a shot cleared off the line in the other.
The former Liverpool striker also enjoyed a good summer, winning the Golden Boot at the European Championships, and Cahill believes that he could flourish now that Didier Drogba's departure has made him the "main man" at Chelsea.
"Maybe he will relish being the main man this season. He has done that at the start of the season and has been great for us. It is good to see him score so early in the season," said Cahill.
"He has dealt with pressure before and that won't be any different for him this time. He is the main man this year and has got off to a fantastic start. Fernando has worked hard in training like he always does. Even when he doesn't score, he works hard for the side.
"To get off the mark already is great and he was scoring goals in the European Championship for Spain so he has taken that sort of form into this season."
Chelsea's next match comes against Newcastle United on Saturday before they face Atletico Madrid in the European Super Cup next Friday.