Pierre-Emerick Aubameyang completed a 56 m move from Borussia Dortmund during winter transfer window. Moreover, Arsenal took Henrikh Mkhitaryan from Manchester United for Alexis Sanchez.
Mhitaryan-Aubameyang duo was one of the deadliest duos during 2015/16 campaign.
Unfortunately for Gunners, Arsene Wenger can’t play Auba against Milan, because of rule #44.2.
According to that rule: “One player from the above quota of three who has been fielded in a UEFA club competition group stage match for another club in the current season may exceptionally be registered, provided that the player has not been fielded a) in the same competition for another club; or
b) for another club that is currently in the same competition.”
As Borussia knocked out Atalanta and still plays in the league, Gabon international will not be allowed to play against Milan, where he spent his early years.