If we reach the Champions League final, that's May 29th, meaning we can play as strong a team as we want for the Chelsea, Newcastle, Brighton and Everton games and still have a week off for the players before the final. Even if we lose on Saturday it's basically inconceivable that we don't win the league.
PSG don't have that luxury, by the way. They play 5th-place Lens on Saturday and risk missing out on the league if they lose. We have the huge advantage of being able to rest most of our players and we'd be fools not to take advantage.