Zinedine Zidane's side secured the title on Thursday courtesy of a 2-1 home victory over Villarreal, and their advantage over second-placed Barcelona is actually seven points, with the Catalan giants suffering a 2-1 defeat at home to Osasuna on the same night.
Having already secured the title, there is not an awful lot for the capital side to play for, but the same cannot be said for Leganes, who are still battling to remain in Spain's top flight.
Here, Sports Mole looks at how Los Blancos could line up in Sunday's clash.
Out: Marcelo (adductor)
Madrid's squad is in excellent shape at the moment when it comes to injuries, with Marcelo, who is struggling with an adductor issue, their only confirmed absentee heading into Sunday's contest.
There is a chance that Zidane could shuffle his pack from the Villarreal game, although it is unlikely that the Frenchman will make wholesale changes.
Indeed, Los Blancos will have a gap of 19 days before their Champions League last-16 second leg against Manchester City, meaning that alterations for this game could be minimal.