The Blues were heading out of the competition on away goals with the tie poised at 2-1 with 20 minutes to go when the Spanish striker clinically found the bottom corner of the net to give his side a 3-2 aggregate win.
And despite the much-maligned 28-year-old missing a late penalty to ensure a nervous finish at Stamford Bridge, Terry insists Torres showed confidence to seize the chance and hopes it is just the start of better things for him.
"It only takes that one goal or something to happen for him to really kick on, but [Torres] is putting in a shift for the team as well," he told reporters.
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"Sometimes that doesn't get picked up as much as it should do. You know what it's like for strikers. Mentally he has had to be very strong - and he is. He has got the full support of the fans and the players. It will always remain that way.
"We are eager for him to score goals. He will certainly get the support and the assists from the quality that we have in the side. [The penalty] is a big sign - him grabbing the ball and taking it in the first place. Obviously, he's a little bit short of confidence but to see him grab the ball, that's maybe the change that he needs. Scoring the goal was great for him as well."
Terry also admitted Champions League qualification is a "must" after being knocked out as holders in the group stages this year, and believes his side can still win both the Europa League and FA Cup with their indomitable team spirit.
"That's the target - to make the Champions League next year, which is a must for us," he continued. "Players are here to win things. We all want to win things. Managers will come and go. Players will come and go. But we must give these fans something to cheer for and to fight for. We are through in the Europa League, we are still in the FA Cup.
"When you go 2-0 down at Man United, then you see the real team spirit," he added. "Nine times out of 10 other teams would chuck the towel in. We went the other way and we kicked on and absolutely went for it. People like David Luiz were excellent and really took the game by the scruff of the neck. That's what you want to see."