Barcelona remain slight favourites to retain their La Liga title, despite both Madrid clubs reducing the gap in recent weeks. Barca are holding steady with the oddsmakers, but Celta Vigo's chances of making the top four took a hit after they were held to a 1-1 draw in Espanyol on Tuesday night.
The stalemate means manager Eduardo Berizzo's men now trail fourth-place Villarreal by six points having played one more game.
Elsewhere, Real Betis scored an important win over Las Palmas at Benito Villamarin. The result moves Juan Merino's side above Las Palmas and Valencia and into the top half of the table.