Injuries to Brahim Daz and Andriy Lunin left Real Madrid with just 10 available first-team players for Real Madrid's crucial LaLiga game against Real Mallorca on Wednesday.
The match has little significance for Madrid but a loss means rivals Barcelona can claim the league title while a win for Mallorca puts them closer to securing a spot in the UEFA Conference League.
Goalkeeper Lunin suffered an injury to his right hand in training, Madrid said on Wednesday, while playmaker Daz was diagnosed with a thigh problem.
Their withdrawals meant Madrid's squad for Wednesday's game at the Bernabu contained just 10 players registered with the first team: Thibaut Courtois, Fran Garca, Federico Valverde, Jess Vallejo, Luka Modric, Dani Ceballos, Arda Gler, Jude Bellingham, Endrick and Kylian Mbapp.
The remainder of the matchday squad was made up of players registered with Madrid's reserve team, Castilla.
Spanish football federation rules state that a team must field at least seven players registered for the category in which the game takes place -- in this case, the first team -- at all times.
If the number of players were reduced to six or fewer, the referee would be obliged to suspend the game, with the offending team forfeiting the fixture for fielding an ineligible lineup.
Dani Carvajal, der Milit�o, David Alaba, Antonio Rdiger, Ferland Mendy, Eduardo Camavinga, Lucas Vzquez, Vincius Jnior and Rodrygo are all out injured. Aurlien Tchouamni is also ruled out due to the yellow card he picked up against Barcelona, which carries a suspension.
The injuries to Vincius and Lucas Vzquez made Real Madrid's problems clear on Monday, and the news arrived at the same time as Ancelotti confirmed his end-of-the-season departure to coach Brazil. Vincius has a left ankle sprain while Vazquez has a left thigh injury.
Vincius and Vzquez were both substituted during Madrid's 4-3 Clsico defeat to Barcelona on Sunday.
On Tuesday, Rodrygo began Madrid's training before indicating to Ancelotti and the team doctor that he was feeling some discomfort, and leaving the session early after just a few minutes.
"He [Rodrygo] had a fever last week, which prevented him from training well and returning to his best level," Ancelotti said afterwards. "Today he felt some discomfort in his leg, which needs to be evaluated.
Sources have told ESPN that Madrid were finalising a deal for Xabi Alonso to become the club's new coach at the end of the league season, replacing Ancelotti.
Alonso announced last week that he would be leaving Bayer Leverkusen after three successful seasons at the Bundesliga club.
