The Catalan outfit trail the leaders by four points with just three games remaining, but Neymar is still hopeful that his side can retain the trophy.
"We must fight until the end," he declared to Mundo Deportivo.
"Hope is the last thing to lose. Even if we have only a one per cent chance of winning the title, we must keep going."
Neymar is currently on the sidelines with a foot injury, but is expected to return to action before the end of the campaign.