With Lazio failing to qualify for the Champions League it makes sense that these rumours about a bid occur now.
I didn't know anything about him. Google told me, that he played for Brazil U17, U20, U21 and since this year also for the real Selecao - which was a bigger achievement in earlier days.
Who can't see the tweet: It's only a picture of him with the brazilian kit, number 10.
I think it's a bit unfair or at least too early to judge the deal or even only the rumours about the deal. The transfer fee is not only about the quality or the fame of a player, but also about his potential, his age, the remaining duration of his contract, etc etc etc. In other words: 40 mio could be way too much... but it could also be a "steal" if the guy is meeting the expectations as a very big brazilian talent. (What a world to talk about a possible "steal" when it comes to 40 mio... )