Competition at the top to get into the top 4 is quite fierce at the moment, Barcelona, Atletico and Bilbao do not have a big gap in points, making it possible for shifts to occur every week.
Yeah, the title is now between Girona and Real Madrid, making it a two horse race. So two positions are left to complete the top four places, and it is going to be a battle from now until the end of the season. I think Barcelona would surely get a spot in the top four, they are not playing at their best, but they are better than the other teams below them, the final spot would be contended by Atletico Madrid and Athletic Bilbao, whichever of them is most consistent would complete the top four and play in next season's champions league.