Croatia's first-choice goalkeeper Stipe Pletikosa has suffered a thigh injury and is doubtful for their Euro 2004 opener against Switzerland on Sunday.
Pletikosa will have a scan on his thigh
Pletikosa felt a sharp pain in his right thigh as he dived to save a shot in a training session on Wednesday.
The 25-year-old was due to undergo a scan in Lisbon on Thursday to determine the extent of the injury.
Croatia will call on either Joseph Didulica or Tomislav Butina if Pletikosa is not fit to play.