Benitez’s Chelsea breezed past Leeds United on Wednesday, sweeping Neil Warnock’s team aside with a 5-1 scoreline despite going behind to a Luciano Becchio goal in the first half.
Five goals followed for the Blues in the second period, but Benitez is not anticipating such a walkover in the semi-final, with Swansea enjoying another good season in the Premier League.
"Swansea are a good team and we have to do well in a semi-final of any competition,” he told Sky Sports.
“They like to play football, on the floor and it will be interesting. Every competition is important for us and a top side like us has to win every competition.”
The former Liverpool manager was content with his side’s performance before the break, but hailed their improvement and reaction after half-time.
“The team was good in the first half, their goalkeeper was doing well,” he added. “The reaction in the second half was fantastic, especially with travelling back from Japan and having jet lag.
“We were looking for character and the reaction was so good, we have to consider it for the future. To know the players and spend time with them is important.
“I was really pleased with the time we spent together in Japan. I was comfortable with the job from the first day and I will try my best until the end.”