Arguably the most surprising transfer on deadline day was David Luiz joining Arsenal from London rivals Chelsea. Not many saw the move coming before the news broke on Wednesday, but speculation mounted that evening, and the following day it was a done deal.
It's a bold move from the defender given the history of the two clubs, with their battle to be the top team in London intensifying over the years. Making such a switch is rare. Well, relatively.
It turns out that there is actually a little list of players to have featured for both clubs in the Premier League era.