Emery could have more transfer funds available if the Spanish head coach is able to steer Arsenal back into the top four in his first season in charge.
Since then though he has positioned the team in fourth spot in the Premier League with eight games of the season to go.
Aubameyang missed two big chances inside a minute to complete his first hat-trick in Arsenal colours, poking wide of the post with just Koubek to beat and then skewing wide of the same post once teed up by Ramsey in front of goal. "And the last teams, they are all very important, and it's going to be very hard", Emery said. I said to the players today, I am excited about this competition.
Aubameyang opened and closed the scoring for the hosts, either side of setting up Ainsley Maitland-Niles for his side's second goal, which should not have stood due to an offside infringement.
But it seems the Champions League performance has convinced the London outfit and they will go ahead with the transfer.
"But I think we can feel this competition like in the Premier League, to do a good way and create, with our supporters, a big atmosphere and a big feeling together to do this way in the Premier League and also here in the Europa League".
In the past the striker has worn Batman and Spiderman masks to toast goals - but he explained why this time was a special moment.
Arsenal pick up a 3-0 win over Rennes in the second leg of their Europa League last-16 tie at the Emirates Stadium to advance through 4-3 on aggregate.
"It's a Black Panther and in Africa, in Gabon we call the national team the panthers of Gabon".
The second leg was a bad-tempered affair with four yellow cards shown to each side by referee Andris Treimanis.