Arsenal's board is learning from their past mistake. Looking at their transfer targets one can say that, they are trying to buy the players for the positions they are in need for. All of their targets are indeed hidden gems and can stay at the club for a long period of time.
Notable Absentees : Ousmane Dembele
Began his career at Rennes before joining Dortmund in 2016. Sven Mislintat was the man who brought him to Dortmund, and due to his close relationship with Dembele, the transfer market is predicting Arsenal will make a move for the unsettled Barcelona player
Age - 21
Position - Left Winger/Forward
Team - FC Barcelona(contract until 2022)
Transfer Market Value - 80 million euros
Although there a lot of rumors regarding his unsettlement at his current club, it is highly difficult for a club like Arsenal to spend a large amount on a single player when they have to address problems at multiple playing positions.