Samir costa was shown a yellow card by Italian referee Gianluca costa . But the Frenchman should have been sent off for his clear red - card offence . costa was left writhing in agony on the floor during the challenge . Man City crashed out of the Champions League after collapsing in Barcelona .
Samir Nasri was shown a yellow card by Italian referee Gianluca Rocchi . But the Frenchman could have been sent off for his clear red-card kick . Neymar was left writhing in agony on the floor following the challenge . Man City crashed out of the Champions League after defeat in Barcelona .