Not passing any comment on whether Lucas will or will not sign for Inter, but a lot of people feel he would simply detract from Coutinho and be an expensive splash for no reason.
We could form a midfield trident of Lucas Sneijder Coutinho. In doing so, you have all three fundamental things you want from attacking midfield. In Moura you have an attacking player with pace and dribbling abilities who does well cutting in from the right. Coutinho is a slightly more technical player who has also a great range of passing and some playmaking abilities.
You put the three of them together, and you have every attribute a defense needs to deal with. Through balls, lofted balls, long range of passing, direct attacking play, passing, pace... The issue, though, for me, is still in midfield. We need someone who can link defense with attack. A pure passer, someone like Poli. Coutinho is also - going from tonight's game - not a guaranteed starter. Lucas Sneijder Palacio could be very interesting, and Lucas could also fulfill the vice-Milito role (along side Palacio). Signing him would also mean Longo or Livaja have space for the forthcoming season, too.
Lucas could be a great signing for Inter. From an FFP side, his total cost would be something equivalent to that of Cesar's salary. It's not, thus, entirely horrendous. A big name signing is something Inter have lacked for a while now.
I'd like to see this transfer happen. Alvarez, realistically, could go out on loan as he won't have much space at Inter, but this could launch him.
Also, look to the future. We almost have a ready made Sneijder replacement in Bessa. He's got the playmaking attributes and vision, as well as a slightly more direct attacking style. Put Bessa in there in a couple years time - assuming he develops well - and we could have a phenomenal Brazilian trio.
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The system I have in mind basically would be:
Sneijder plays like he did under Mourinho. Free attack role. No defensive duties.
Moura plays a more advanced version of Maicon, using pace and strength to cut inside, coupled with his turning ability, to get past defenders.
Coutinho does his thing on the left, cutting inside or going wide, using his array of tricks to buy space.
If the players come up against defenders who get used to them or can combat them well, you make them flip sides. Both are pretty ambidexterous I'm led to believe, and it would sparken things up.
And, honestly, I'm just dreaming of throwing Bessa into the mix too. You put Bessa with them two and you've got a trident for the next 10 years.