Nope, no thoughts one way or the other about the player other than, on paper, he sounds like the sort of player we need.
As I understand it, any deal for him hinges on how much the buying club could pay upfront, because of some sell-on clause that entitles his former club to a chunk of any fee? Something like 24m might sound like a good fee for a relatively unproven young player, but if we're looking at one of those half now, half later deals, then I think Sporting would only end up pocketing something like 7m, which, in that light, isn't such a great incentive to lose one of their best assets...