
Eduardo will miss the visit of Blackburn after picking up a groin problem during extra time in Arsenal's victory over Roma on Wednesday night.
The Croatia striker sustained the injury in the first period of the extra half-hour in Rome, and went on to miss his penalty.
The 25-year-old missed 11 months after breaking his leg last season, and has now suffered two minor injuries since making his return on February 16 - a common occurrence after long-term injuries as players seek to get back to match fitness.
"Unfortunately we have lost Eduardo with a groin problem," Arsenal boss Arsene Wenger told Arsenal TV online.
"He got it in the first half of extra time and I wonder if that stopped him from taking his penalty that well.
"It shows you that no matter what you do in training when you go to the uncontrolled movements of top, top level competition your body needs time to adjust. It is only a short-term injury but he is out for Saturday."
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