article_snippet: Former Chelsea defender David Luiz striker Diego Costa clashes with former Blues defender Former Chelsea defender David Luiz .
article_snippet: Costa pushes over Marquinhos behind the back of referee Bjorn Kuipers (right)
article_snippet: Costa (left) gets into an altercation with Paris St Germain's Thiago Motta (right)
article_snippet: PSG styriker Edison Cavani remonstrates with Chelsea's Eden Hazard .
article_snippet: Costa (left) argues with PSG midfielder Yohan Cabaye after the final whistle .