Barcelona have become stronger with Xavi, but to win La Liga is not enough, in order to prove how strong they are, for this you need to show good results in the Champions League. This year they are more fortunate with rivals in the group stage, most likely they will not have big problems to reach the playoffs together with Porto, Antwerp and Shakhtar are not the teams that can compete with Barcelona.
Actually winning La Liga tittle is seems enough prove how compete Xavi Hernandez as Barcelona head coach, they have missed with La Liga tittle almost three years and arriving Xavi can helped Barcelona winning back La Liga tittle. But still face problem when Barcelona playing in UEFA Champion League, have been two season in a row Barcelona failed for qualifying from group stage and this season time for him to make Barcelona get chance qualify to next round and winning Champion League tittles.
Current drawing group in Champion League, actually Barcelona not face difficult group what happen last season how to fight with Bayern and Inter, but in this season Barcelona looks in easy group because Porto, Antwerp and Shakhtar is not really difficult opponent for Barcelona.