A strong squad including Henrikh Mkhitaryan, Mesut Ozil and Jack Wilshere all came through Wednesday’s session before heading to Luton for the flight.
They face the Serie A giants in a round of 16, first-leg clash at the San Siro on Thursday in the knowledge that they must win the competition to have any realistic chance of returning to the Champions League next season and, in effect, save their manager’s job.
Back-to-back defeats in the Premier League have left the Gunners trailing fourth-placed Tottenham by 12 points and Wenger has admitted they are likely to finish outside the Champions League places for a second successive season.
Now coming under huge pressure to leave at the end of the season, it is understood that only a return to Europe’s elite competition will allow Wenger to see out the final year of his contract.
Winning the competition would grant them a berth and thus save Wenger’s job, but it would also give him the chance to bow out on a high with what would be a fourth major trophy in five seasons.
Before he can think about that dilemma, however, Arsenal must find a way past an AC Milan side enjoying a resurgence under Gennaro Gattuso. They are unbeaten in their last 13 games across all competitions, winning nine.