It wasn't just the draw of Champions League football and Thomas Tuchel that brought Pierre-Emerick Aubameyang and Denis Zakaria to Stamford Bridge.
Chelsea relied on previous relationships to help them draw in their two deadline day signings, and just in case Didier Drogba hadn't done enough for the club, his impact is still helping the side to this day.
The Ivorian, who left Chelsea for the second time in 2015, has played his own role in the club's newest additions, giving his approval for the deal of Aubameyang whilst also being mentioned as reasons for both Wesley Fofana and Zakaria's move.
