Aubameyang, Giroud, Batshuayi caught up in 'transfer merry-go-round'

Who holds the key to Arsenal's hopes of completing a move for Borussia Dortmund striker Pierre-Emerick Aubameyang ?
That would be Chelsea, according to the Mirror. The paper said Arsenal "could be forced to let Olivier Giroud go to Stamford Bridge to make the Aubameyang deal happen."
The Blues are set to loan Michy Batshuayi to Dortmund, where he would replace Aubameyang, for the rest of the season. But they would then want a replacement striker of their own -- and that means Arsenal, "stuck in a transfer merry-go-round," might have to do a deal for Giroud.
The Mirror said the situation "has set up a frantic last 48 hours of the window, with Arsenal sweating on Aubameyang, even though he is desperate to move to the Emirates."
Kicker, however, said that Dortmund are more likely to land Giroud after Chelsea decided against signing the Arsenal striker.