Sure barcelona still have a hope to remain in the top of the table, because they still have one outstanding match which is against osasuna and I think barcelona will struggle so hard to defeat them so as to give real madrid a little distance because as it stands real madrid and barcelona has equal point and if barcelona fails to secure this 3 point they won't be surprise to see real madrid topping the league, but with there performance lately I don't think if barcelona can afford to lose against osasuna next week.
I also don't think Barcelona will lose when they host Osasuna next weekend because Barcelona is always stronger when playing at home. And even if the result of their match ends in a draw, it will not immediately be a disaster for Barcelona because the top position will still belong to Barcelona even though it is not with a significant difference in points. In addition, Barcelona is also still superior in terms of the number of goals they have scored this season so that it can also be a separate help for Barcelona in terms of maintaining its position at the top of the La Liga standings this season.