The Argentine forward netted a double to help his side to the full three points, but he expects the first leg of their semi-final against the Premier League side to be yet another tough task.
"We have to continue like this. Now it’s time to think about Chelsea, this is the most important match. It will be more difficult than the match against Levante," Messi was quoted as saying on the club's official website.
"We knew it was a difficult ground, Levante are having a fantastic season and we managed to get a great result."
Messi has already netted 41 Liga goals this season and is level in the goalscoring charts with Real Madrid star Cristiano Ronaldo. The attacker isn't thinking about individual success though as he insists that the team is all that matters.
"Things are going well for us, but what’s really important is that we’re both fighting for the Liga title. I’m happy that I scored because the team won."
The first leg of Barcelona's Champions League semi-final will be played at Stamford Bridge.