01 October,2013 01:14 AM IST | | AFP
The 21-year-old - who has played just twice this season because of a mixture of injury and being left out by coach Massimiliano Allegri - has a fractured left foot, the club announced.
"El Shaarawy, who was called up for the game has not been able to travel to the Netherlands because of a tiny fracture of his left foot," Milan announced in a statement.
With El Shaarawy out Allegri will likely select Mario Balotelli and Alessandro Matri up front, Slovenian Valter Birsa - who scored the winner on Saturday in the 1-0 win over Sampdoria in what was only their second victory in six Serie A games - will fill the role of playmaker.
Milan travel to Amsterdam on the back of beating Celtic 2-0 in their opening group match while Ajax slumped to a 0-4 defeat by Barcelona.u00a0