Worst case scenario is we commit to spending £60m+ on him, he comes in, is utter brick, then breaks down with a chronic injuries ala Lamela/Wanyama and runs his 200k a week contract through the next 5 years and we never see a performance or return from/on the player.
Using the above, you wouldn't spend 50m either would you? You'd never sign a player if you worried about that eventuality.