Roman Abramovich’s £1bn spend: Chelsea’s 10 most expensive signings under Russian oligarch rated

8) Oscar, £25m, 7/10

It is yet to be seen if the Brazilian will become a hero at Stamford Bridge, but the 23-year-old has made a good effort of it so far. He has quickly become a regular in the side since arriving in 2012, and could be a key part of their midfield for years to come.