The Reds are 11 points behind Manchester City and possess a game in hand.
"At the moment City are already with a proper gap, let's say it like that, so it's up to us to try to close that gap," the Portugal international told the official matchday programme.
"Of course, in the league game at Chelsea we matched each other and if Manchester City were watching they would have been happy with that outcome as we both lost points. But we just have to keep going and try to close that advantage.
"It's not going to be easy, but we will be doing our very best so I think we will be able to take it until the very end of the season and I hope that's what happens."
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