Ghana winger Quincy Owusu-Abeyie suffered a knee injury while in action for Panathinaikos in the Europa League on Thursday night.
The 26-year-old limped off in the 35th minute after clashing with Maribor midfielder Cvijanovi?.
Panathinaikos doctors will further assess the extend of the injury to their wing-wizard.
The former Arsenal youngster was electrifying on both flanks for the Shamrocks before picking up the injury.
Spanish midfielder Vitolo converted a second-half penalty book a 1-0 win for Panathinaikos and keep the Greek side's qualification hopes alive in Athens and dumped out the Slovenian title holders.