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At least in the group stage you can trust and let the newcomer prove himself, because Barcelona are not in the most difficult group, you can even experiment a little. Although there is also La Liga for that, so as not to take risks in such a tournament, especially for Barcelona this season it is very important. So far I see that Barcelona can definitely get out of the group, maybe even reach the quarter-finals, and then it all depends on the opponent
Basically, almost all groups look easy to become top of the standings for some of Europe's top teams, except for group F. Barcelona is fortunate to get relatively easier opponents this season, but I don't really dare to guarantee they can qualify easily and lead Group H in the end.
All teams can be surprised that Barcelona still has the possibility of failing to reach the last 16 if all the opposing teams are really able to make it difficult for Barcelona to win the match. I agree Barcelona are favorites in Group H, but that's not a guarantee to see them through easily to the next round.