#2: Advantage in the Champions League

The Champions League is the biggest club competition in the football world. With their below-par performances in the league, the Gunners failed to qualify for the competition for the first time since the 1999-2000 season. Also, the Londoners have found it tough to break the Round of 16 hurdle for the past six years. They last qualified for the quarter-finals back in 2009-10 season.
Arsene Wenger has always managed to secure a Champions League spot through play-offs. But, Ancelotti's arrival will definitely signal an end to Arsenal's mediocrity and the curse of Round of 16.
Ancelotti is the only manager after Liverpool boss Bob Paisley to win the Champions League three times in his managerial career. The Italian was the mastermind behind the historical La Decima winning team.
Ancelotti does guarantee Arsenal a quarter-final spot, given his exploits with previous employers. The Italian has managed 1 round of 16, 3 quarterfinals, 1 semi-final and a Champions League trophy since the 2009-10 season.