Wenger had been an ardent fan of the 4-4-2 formation, but switched to the highly tactical 4-2-3-1 to bring out the best in his previous captain, Cesc Fabregas, and create space for the club's midfielders. At the start of the 2009/10 season, Fabregas became the linchpin of the formation, and it yielded much fruit as he had his best season in Arsenal colors—scoring 19 goals and making 19 assists.
However, Arsenal ended another campaign trophy-less after losing in the Carling Cup quarterfinal 3-0 to Manchester City, suffering a 3-1 FA Cup loss to Stoke City, a 6-3 aggregate drubbing at the hands of Barcelona and finishing 3rd place finish in the Premier League.
Arsene Wenger was active in the summer transfer window of 2010, bringing in the likes of Marouane Chamakh, Laurent Koscielny and Sebastien Squillaci. After employing the same 4-2-3-1 formation for the 2010/11 season, Jack Wilshere, Samir Nasri and Robin van Persie were the players that set Arsenal's campaign alight.
But that season also ended in disappointment, as Arsenal finished the league in 4th place, lost in the FA Cup quarterfinal to Manchester United and was knocked out of the Champions League in the 1st knockout phase by Barcelona. Arsenal's closest shot at a trophy was the Carling Cup final against Birmingham City, though that ended in a shock 2-1 defeat.
More transfer activity took place this summer, with notable figureheads like Cesc Fabregas, Samir Nasri and Gael Clichy leaving for greener pastures. With Arsenal needing the quality to challenge for the Premier League, as well as hunt for other trophies, Wenger waited for the last day to bring four new, vastly experienced, players to blend with the team.
For once, Wenger didn't go down the 'all youngster lane', although he did bring in 18-year-old Alex Oxlade-Chamberlain, and he also got a work permit for the 19-year Ryo Miyaichi.
Arsene Wenger's new look squad is filled with depth and is strong enough to challenge for the Premier League title, as well as challenge for other trophies.
Here's my take on Arsene Wenger's possible XI for the season ahead