Five lessons from Arsenal's impressive 4-1 win over Galatasaray

There were plenty of things to consider in the wake of the Gunners' Champions League win in Group D.

Left wing could be the best spot for Sanchez

Arsene Wenger may not have been certain what the former Barcelona's man best position was when he brought him to the club, such is his undeniable attacking ability. The Chilean has already played every attacking position for the Gunners in his two short months at the Emirates, with varying degrees of success. On Wednesday though, Sanchez had one of his strongest games for Arsenal against Galatasaray from the left wing, as he formed part of a rapid front three alongside Oxlade-Chamberlain and Welbeck. The trio were the side's best performers, and employing them in this manner also leaves that central playmaker spot free for Mesut Ozil.

This was the perfect game for Welbeck

Make no mistake about it, Galatasaray and their three man defence were woeful until Arsenal went down to ten men. With lots of endeavour but just the one goal to his name since he joined the club, Welbeck needed an opposition there for the taking. And there is no denying the former Manchester United star was ruthless with how he went about his job, surely causing all those who questioned his talents as a striker to doubt their own decision making somewhat. Displaying excellent finishing, incisive runs and pace that punished the opposition back line, Welbeck netted three times for the first time in his career, and it will be interesting to see how confident he is against Chelsea at the weekend.

The pace in Arsenal’s front three has to be utilised against Chelsea

The system Wenger employed on Wednesday made the most of the side's speed and trickery down the wings, while Welbeck impressed with the timing of his runs and his decision making as he played off the creativity on offer. Arsenal are likely to miss Aaron Ramsey and Mikel Arteta against a powerful Chelsea midfield, but if Sanchez and Oxlade-Chamberlain carry this sort of form to Stamford Bridge on Sunday, the likes of Branislav Ivanovic and John Terry, who are not renowned for their pace, may need some serious assistance by whoever Mourinho selects ahead of them.

David Ospina proved he is a capable alternative if Szczesny can't cut out his mistakes

Wojciech Szczesny has to be careful - Arsenal have another top goalkeeper at the club. Though David Ospina took his time getting ready to come on, such was the surprise after the Pole's straight red for scything down Burak Yilmaz, he certainly didn't need to warm up, and made a series of impressive saves as Galatasaray staged a late rally in order to start an improbable comeback. Szczesny has a real rival on his hands with the Colombian, and if he carries on making questionable decisions like he did when coming out to challenge Yilmaz, all guns blazing, despite it being 4-0, then he could find himself on the sidelines.

What an anniversary for Wenger

There has been plenty of talk in recent days of Arsene Wenger's 18th anniversary at Arsenal Football Club, and rightly so given that he is the country's longest serving manager by some way, so the Frenchman will be delighted to have marked the occasion with such a emphatic result. Though Szczesny's sending off added a bit of extra drama to proceedings, something Wenger would certainly not have been wishing for, on the whole the Gunners were hugely comfortable, and demonstrated their attacking force emphatically. That summer signings Welbeck and Sanchez, not to mention the excellent Callum Chambers, all highlighted what they bring to Wenger's squad, will have provided that extra layer of satisfaction to the 64-year-old's birthday cake.

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