Arsenal are keen on signing Borussia Dortmund forward Aubameyang before Wednesday’s transfer deadline.

However, they are yet to meet the asking price the Bundesliga club have slapped on the 28-year-old frontman.

Mariner admits after the arrival of Henrikh Mkhitaryan from Manchester United that it would be a good window for Arsenal if they secured Aubameyang.

But he is worried for his former side if they fail to do so.

“I think most Arsenal fans would be very, very happy with the forward-line situation (if they signed Aubameyang),” he told ESPN FC.

“There is still the dark cloud that is (Mesut) Ozil but we’ll cross that bridge when we come to it.

“(It would be) very concerning (if they don’t get Aubameyang). I’ve said it for weeks and weeks and weeks. 

“I think it’s imperative that they get something for (Alexandre) Lacazette to feed off, he needs service in the box. 

“If you’re going to bring Aubameyang in and you’ve got Mkhitaryan in, get Mkhitaryan in the right position. 

“Is that the right position in the No 10? Is Ozil going to play in the No 10? 

"So there’s all these things that (Arsene) Wenger has got to work out. 

“There are very concerning spaces in that team for me before we think Arsenal are going to get back on track.”