Thiago is a very good player. 5* skills are really useful for a player of his position and he is a beast if used correctly.
Passing good enough it doesnt need upgrading
Good value for coins
Good nation and club - strong links with goretzka lewandowski etc
3* weak foot is a slight issue, however not too bad.
His pace is ok for a midfielder however you might want to boost it depending on where you play him.
Shooting is a little bit hit and miss which is why i choose to give it a massive upgrade - with the sniper chemstyle there was a massive improvement.
His physical stats are weak but this doesnt matter too much for someone in his position