He was equally convinced his team should have been given a chance to score from the spot too.
“I think it was outside,” he said of the first turning point.
“Then it should have been a penalty for us.”
Liverpool, who have a very important week in prospect in the Champions League and Premier League, finished the game with Steven Gerrard on the substitutes’ bench - after Benitez decided it was time the captain had a rest.
“We knew it was tough, because some of our players were playing a lot of games in a row,” he explained.
“At 3-1 (down), you have to protect your good players.”
The Reds had several opportunities to get back in the match, and Benitez added: “It was a strange game. We had a few chances but did not take them.
“After some decisions which we didn’t get, we couldn’t change the result.
“The ’positives’ are no injuries and no yellow cards.”