Milan have a possible goalkeeping crisis on their hands ahead of Wednesday's UEFA Champions League clash with Arsenal.
Dida is a major doubt after injuring his back in a freak incident while sitting on the bench during Milan's goalless draw with Parma.
Zeljko Kalac, who has been starting in recent weeks, has added to Carlo Ancelotti's problems after suffering a dislocated finger in training on Sunday.
Milan will assess the fitness of the Australian international before deciding whether or not he will make the trip to North London.
A club statement read: "AC Milan announces that during the training session of today (Sunday), goalkeeper Zeljko Kalac suffered a dislocation to the phalanx of the index finger in his right hand.
"His condition will be evaluated tomorrow to understand whether he will be available for London against Arsenal."
If Kalac and Dida are ruled out it means third choice keeper Valerio Fiori could be forced into emergency action having made his last appearance for Milan in the 2003/04 season.