This article is part of Football FanCast's Monthly Review series, which analyses what managers can learn from the previous month and what the coming month could have in store.

September was a rather trying month for Barcelona, but despite some mixed results in both La Liga and the Champions League Ernesto Valverde should still learn two crucial lessons from last month.

The midfield trident

It really did take Valverde quite a long time but it seems that in September, he finally realised Sergio Busquets, Frenkie de Jong and Arthur Melo should be his starters in the middle of the pitch.

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At the very beginning of the campaign, we saw the coach experiment just a tiny bit with this, introducing different names to the equation but none worked quite as well as the aforementioned trident.

If he is going to take any positives away from last month, then it should definitely be this midfield revelation.

And sure, it took him far too long to do that, which fans promptly noticed right away, but the key is that he now seems adamant in sticking with those three in the middle, courtesy of a recent report from Mundo Deportivo.

Antoine Griezmann vs Luis Suarez

This is definitely one that still needs fixing.

Griezmann and Suarez have so far mostly been used next to each other as opposed to having a friendly competition in the squad. As a result, the Frenchman was shifted to the left and the Uruguayan was given the centre-forward position.

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But this did not really yield favourable results for Valverde. Griezmann has scored three goals in La Liga, scoring in just two games, while Suarez has the same number from the same amount of fixtures.

Still, the coach is refusing to permanently bench his 32-year-old veteran, playing him in a total of five games so far in the 2019/20 La Liga season.

Of course, it's not easy to bench such a big name as Suarez but every player in the squad should be getting his spot on merit rather than on his reputation and as things currently stand, the Uruguayan forward is in the latter group.

There's a lesson to be learned for Valverde here. Hopefully, he learns it.