It was always going to be an eventful January for Arsenal.After all, when you allow the contracts of your two best players to run down to their final six months, what do you expect?While it looks as Mesut Ozil will stay until the summer at least, the same can’t be said about Alexis Sanchez.The Chilean was always likely to leave the Emirates during the winter transfer window - although we all thought that he would be joining Manchester City.That’s not quite the case, though, with Alexis set to join Manchester United.But Arsenal could come out of the January transfer window stronger than before - despite losing arguably their best player.That’s because not only are expected to get Henrikh Mkhitaryan from United in return for Sanchez, they’re also being linked with a sensational move for Pierre-Emerick Aubameyang.The striker has been left out of Dortmund’s two previous squads and reports suggest he has agreed a fee with Arsenal.But there’s one small issue to sort out - the transfer fee.Despite his ill-discipline in recent weeks, the 28-year-old is one of the most prolific strikers in European football.In the last three seasons at the Westfalenstadion, he’s scored a crazy 100 goals in 118 appearances in all competitions.Therefore, Arsenal know they will have to spend big in order to sign him.

THE UPDATE FOR AUBAMEYANG'S SIGNATURE

And, on Saturday, they officially submitted their first bid.

According to German outlet, Kicker, the north London club put in a bid worth £46 million.

But there’s a problem.

The Bundesliga club value Aubameyang at £53 million and are unlikely to accept Arsenal’s first bid.

DORTMUND BOSS ON AUBAMEYANG

Dortmund played Hertha Berlin on Friday night without Aubameyang and could only draw 1-1. Meanwhile, the want-away forward was seen playing five-a-side with his mates at the same time.

And Dortmund boss Peter Stoger insisted he had no problem with that.

"Well generally it doesn’t bother me at all if Aubameyang right now is kicking it around somewhere else. That’s his decision," Stoger said.

"If he had been good the moment we had training, he would have played [Friday] today. "But I didn’t have that impression of him in the last training before the match. I felt like he was busy with many things but not this important match. That’s why he wasn’t with us.

"If he is also playing football all the time next week and there are photos of him, then he will be in the squad against Freiburg."