Benitez, whose side had to rely on a late Fernando Torres strike to earn a draw at Brentford on Sunday, refused to criticise his defence afterwards, however, and insisted the club is improving under his stewardship.
"We all take responsibility. We don't blame anyone: it's for us to analyse why we didn't kill the game off, and to work to stop the mistakes," the Spaniard said.
"We're still in a really good position in the table, but it could have been really better.
"We are improving a lot. We did an exercise with corners and free-kicks yesterday and it was fine. Today for 85 minutes it was perfect."