Barcelona needs a win in this match because they let Real Madrid get too close, but the odds for Barcelona to win are too low to bet on them, and Las Palmas are not as good as they used to be, they have a weak defense, they can't stand up to Barcelona's attack. Real Madrid will play Getafe, they also need a win and the odds are 1.39 which looks much better.
For the sake of staying at the top of the table continuously Barcelona needs a win in this game but a draw wouldn't do so much harm actually, they can still be able to get a point to help them stay ahead with some good number of points away from Madrid who isn't looking so healthy in their form and strength which includes their tactical form. Palmas isn't looking so much like a challenge to Barcelona from my point of view I know they shouldn't be underestimated but it still isn't an assurance that plamas wouldn't get victory over Barcelona.