The Catalan side slumped to a 3-2 defeat to Osasuna on Saturday, allowing Jose Mourinho's men to take a commanding lead by beating Levante 4-2.
"We are happy because we have been on an upward line," Higuain told Marca. "The truth is we don't think we are there yet, but there is much more.
"La Liga is in our hands, but we have to keep working."
The Argentine's striking colleague, Karim Benzema, echoed his team-mate's call for his side to maintain their focus.
"We played a great game, but now we must continue. The difference in points with Barcelona is great, but we still have to keep fighting because there's a long way to go.
"This is not over yet. We're pleased to be top, and so we celebrated the victory together, however, we recognise that we have to go match by match."
Alvaro Arbeloa also urged his team-mates to not count the title as their own and said that any such assumptions would be disrespectful to their adversaries.
"There are many games left and it would be disrespectful to our opponents to say the league is won. Now we must think of [Saturday's] Racing game and take it match by match."
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