Chelsea overcame Steaua Bucharest at Stamford Bridge despite some rocky patches throughout the ninety minutes.
Chelsea made hard work of their qualification despite a positive start in which Juan Mata gave them the lead.
They had lost the first leg in Romania 1-0 and when Vlad Chiriches scored a crucial away goal on the stroke of half-time, Chelsea needed two more goals to go through.
Captain John Terry led the way by restoring their advantage on the night before Torres snatched the vital third, although he then missed a penalty which would have calmed the home nerves.
Goalkeeper Peter Cech said Sunday’s two-goal comeback at Manchester United in the FA Cup had given his side belief.
“When it went to 1-1 we had to score twice but at the weekend we managed to get (back) a 2-0 deficit at Old Trafford so we believed we would get the goals,” he said.