Mbappe's dismissal put his team-mates under pressure but Alaves were also reduced to 10 players in the second half when Manu Sanchez hacked down Vinicius Junior.

Eduardo Camavinga's curling effort from the edge of the box was enough to split the teams as Madrid produced a gritty display to match Barcelona's single-goal victory over Leganes on Saturday.

Assistant coach Davide Ancelotti took the place of his father Carlo Ancelotti, who was suspended, in the Madrid dug-out.

Los Blancos began with Vinicius on the bench, with the Brazilian's inconsistent form and the upcoming Champions League battle against Arsenal in mind.

Carlo Ancelotti had called for his team to defend better after conceding 11 goals in the last four games, including the painful 3-0 quarter-final first-leg defeat to the Gunners on Tuesday.

That call may have fed into Mbappe's wild foul on Antonio Blanco which caused the striker's dismissal.

By then Madrid had taken the lead in a hotly-contested clash at Alaves' Mendizorroza stadium.

The visitors appealed for a penalty early on when Arda Guler and goalkeeper Jesus Owono collided.

Raul Asencio's header hit Joan Jordan and bounced in but the goal was ruled out for an Antonio Rudiger foul on Owono.

Eventually, Camavinga curled home from the edge of the box after being teed up by Fede Valverde to send the Spanish champions ahead.

Mbappe's red card after 38 minutes was a set-back for Madrid, who came under pressure in the second half.

Los Blancos fought off the hosts and brought on Vinicius and Jude Bellingham, who had also been given a rest.

Alaves were reduced to 10 men when Vinicius broke loose and Sanchez hacked him down with a poor challenge, which might have merited a red card even if the defender was not the last man.

That made life easier for Madrid in the final stages and they came closer to scoring a second than Alaves did to an equaliser.

Valverde whistled a long-range effort inches wide of the top corner, while Madrid were also able to bring on midfielder Dani Ceballos for a few minutes after he recovered from injury.

The clean sheet will be a morale boost for Los Blancos, who can turn their attention to Arsenal's visit to the Santiago Bernabeu on Wednesday.