The One Quality Signing Arsenal Must Seal This Summer

After average results in the last campaign, Arsenal need top quality signings to improve the squad in the summer transfer window. Not to forget, the Gunners will be playing in the Europa League for the first time under the management of Wenger.
The North Londoners have already signed Sead Kolasinac to strengthen their back line. He will most likely replace 31-year-old Nacho Monreal in the starting XI next season.
Arsene has more than a few quality defenders in his team but he does not have a proven quality out and out striker. Since the departure of Dutch star Robin van Persie, Arsenal have never been able to find a prolific No.9.
French international Olivier Giroud has been effective but he has never scored 20+ league goals in a season since moving to Arsenal. On the other hand, Danny Welbeck has been injury prone in the last two seasons and overall, he has netted 10 times in 52 league outings for the Gunners.
Star playmaker, Alexis Sanchez, netted 24 times in the league last season but his future is in doubt. The Chilean international is heavily linked with German giants Bayern Munich (Mirror).
In such a scenario, the North Londoners must seal the signing of a top out and out striker and recent reports (via The Sun) suggest that they want to sign Lyon’s Alexandre Lacazette.
The Les Bleus striker scored 37 goals and provided 5 assists in 45 games for the Ligue 1 side last season but can he replicate such form in the Premier League?
Even Giroud was a hit in the French league. He scored 21 times in Montpellier’s title winning 2011/12 campaign but his highest tally in a PL season is 16 (13/14 & 15/16). In your opinion, who should Arsenal sign to reinforce their strike-force?
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