Croatia's midfield icon Luka Modric suffered a muscle injury in his side's 2-2 draw with Czech Republic Friday that coach Ante Cacic said may have caused his side's loss of a two-goal lead.

The Real Madrid star came off in the 62nd minute of the game with what Cacic called "a muscular problem".

Cacic said Modric was his side's "most important player" and his absence along with flares thrown on the pitch by Croatian fans could have caused a meltdown.

Modric is now a major doubt for Croatia's final Group D game against European champions Spain on Tuesday.