David Luiz, Paris Saint-Germain to Chelsea: 
The shaggy-haired Brazilian’s deadline-day return to Chelsea was one of the biggest surprises of the transfer window, after PSG paid £50 million to make him the world’s most expensive defender just two years earlier. However, Luiz, 29, was tipped to lose his place to compatriot Marquinhos at PSG, and has returned to Stamford Bridge for a reported fee of around £34 million.