20m plus Vucinic for Lamela? 25m plus Vucinic could put you in Di Maria territory, and I think he's far more the finished, established product the club needs right now. Lamela definitely has the potential, but that investment comes with far greater risk IMO, considering that he may or may not recover to regain or develop WC form, after a season of failure. At least, you can't say with younger talents and their temperament.