SHOULD PHILIPPE COUTINHO HAVRE PLAYED AGAINST BARCELONA IN THE CHAMPION LEAGUE?

Barcelona played Bayern Munich at the quarter finals in the champion league match, with a very impressive show as well as a thumping victory of a score of 8-2 win over the Spanish giants Barcelona. But my very big question here is the Brazilian Philippe Coutinho scored two goals and also one assist as well. But you must remember that Philippe Coutinho is actually a Barcelona player and registered under F.I.F.A., but he has been on a loan deal wiith Bayern Munich for the last two years. But clubs usually add a clause in their loan deal contract. This clause clearly says thaythat a player on loan can not play against their parent club. So was this clause violated by Bayern Munich, or was tge clause not written in the contract.