Jose Mourinho, who left Inter Milan for Real Madrid after leading Inter to their first European Cup success for 45 years in May, returns to the San Siro to face AC Milan with Real in a group that also includes Ajax Amsterdam and Auxerre.
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Bayern Munich, who lost May's final to Inter in Madrid, will face AS Roma, Basel and CFR Cluj in their opening matches.
Auxerre's task in Group G looks so tough, with matches against the competition's two most successful sides in Real Madrid and AC Milan, not to mention four-times champions Ajax, that coach Jean Fernandez was resigned to an early exit.
"I could feel it," Fernandez told Canal Plus television. "We'll finish third and play the Europe League because it will be very complicated against Milan and Real."
"Certainly we will be pumped up to face Real," Allegri told the club website. "The San Siro and Bernabeu will be rocking. A spectacle is assured.
"Ajax and Auxerre have brilliantly got through the playoffs and they are two opponents to really fear."
