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I do not think that anyone will condemn Koeman for the defeat in the classic - Real looks much stronger than Barcelona, which is in a difficult situation through no fault of the coach. But if Barcelona lose their next Champions League game, then that could really be a reason for retirement. Dynamo Kiev is not a strong opponent at the moment and a defeat will cost Barcelona an entry to the playoffs.
Barcelona looks really weak in tommorows elclasico,i think real madrid has an amazing chance to win against Barcelona and put them a few places back. Reals attack is much better then Barcelonas currently and i dont trust Kooman at all as a barcelona coach
If Koeman is able to prove that he won in El Clasico then he still has hope to be believed by many people including Real Madrid is a tough opponent for now because in difficult times for Barcelona who face more difficult opponents then I predict this will make it easier for Madrid to win.
However, Koemna must be able to believe in players who are mentally weak at this time and with any strategy or tactics can change players but this is a tough thing after El Clasico and has to challenge the UCL again.