Raul Rusescu's 34th minute penalty was enough for the Romanian side to overcome the reigning European champions at Bucharest's National Arena in the first leg of the Europa League Round of 16 but Benitez feels his side is good enough to achieve the required result at Stamford Bridge.
"I think it was a difficult game," he said. "The pitch was not the best but we were disappointed because we conceded a goal because of a soft penalty and I thought their keeper made one or two good saves.
"It was difficult because in the counter attack they were dangerous but our keeper was not making any saves. I felt we could have scored and now we have to do everything at Stamford Bridge.
"It will be difficult because they are quite organised, they work very hard and they can counter-attack. But we have confidence that we will do well at Stamford Bridge."