Benitez was talking after victory over Sunderland.
He said: "I don't think it will be possible. Tottenham and Arsenal are pushing, and Everton, so we have to carry on until the end. Hopefully we can do well next week in the cup competitions and after against Fulham and Liverpool. We can't say it will be done because they will be pushing too.
"It's important to have everyone sticking together and pushing in the same direction. It's very simple and very clear."