The Croatia star fears his season is over after straining knee ligaments in Real's weekend win over Malaga.
Madrid revealed in a statement on Sunday on their official website that Modric had strained the medial ligament of his right knee against Malaga on Saturday.
The Spanish giants said the midfielder’s “situation will be monitored” and although they have not yet put a timescale on his absence, Modric is expected to be sidelined for around five to six weeks.
This would rule him out of the rest of Real’s campaign as the club attempt to pip Barcelona to the La Liga title and retain their Champions League crown.
Modric picked up the injury in a challenge with Malaga midfielder Recio and left the pitch clutching his knee and asking to be substituted.
According to Spanish newspaper Marca, Modric was so downhearted after his team’s 3-1 win that he broke down in tears in front of his teammates.
He knows he will be absent from Real’s decisive Champions League quarter-final showdown against Atletico Madrid next Wednesday and fears his season is over.
Losing the Croatia international would be a major blow to Carlo Ancelotti, as the midfielder is a regular in the Italian’s team and was sorely missed during his three-month absence either side of Christmas with a thigh injury.