PSG knocked Chelsea out of the Champions League on away goals . David Luiz revealed that CostaDiego Costa is a friend despite their clashes . Chelsea forward Diego Costa was involved in a number of heated exchanges . Luiz says Diego Costa is 'top guy ' and played down the physical battle . Click here for all the latest Chelsea news .
PSG knocked Chelsea out of the Champions League on away goals . David Luiz revealed that Diego Costa is a friend despite their clashes . Chelsea forward Costa was involved in a number of heated exchanges . Luiz says Costa is 'top guy ' and played down the physical battle . Click here for all the latest Chelsea news .