A. Atletico Madrid win the title
A win and a draw in their two games will hand Atletico the La Liga title even if Real and Barca win their remaining games. However, this is easier said than done considering their last game is against Barcelona at the Camp Nou. Even a draw there will suffice if Real Madrid drop points in their remaining games

B. Real Madrid win
Real will have to win all their three games and hope arch-rivals Barcelona do them a favour and beat Atletico Madrid