The Blue's interim manager had to wait until the last kick of normal time to see his team avoid extra time and possibly penalties as Eden Hazard struck to ensure they drew 1-1 on the night, for a 2-1 overall aggregate victory.
Benitez has been under pressure since landing the job back in November, and some fans have been vocal in their opinions.
Torres again failed to produce, as he has done for most of the season, but Benitez defended the striker whose only goal in the last 14 games came against League 1 opposition, Brentford.
"[Torres] didn't play badly tonight," Benitez told reporters.
"You can analyse a striker for the number of goals he scores. Maybe you're right. But he did a great job for the team tonight. It's not easy against a team playing deep, but he was winning the ball in the air, bringing options for those around him.
"I thought he was playing well. I disagree he was playing badly. But of course we want him to take the chances that come his way.
"If he continues working like today and playing like he did today, he will score goals. I'm convinced about that. We could be talking about Fernando not scoring goals, and he had four chances. But he had four chances."
Benitez will hope his side leave last night's sloppy performance behind them as they prepare for a trip to Manchester City on Sunday in a bid to close the gap on Roberto , before a midweek journey to Middlesbrough, where victory will set up an FA Cup quarter-final against Manchester United.