I think that's a question for the player himself.Absolutely he’s not irreplaceable but a question I might ask is why is getting the most out of what is clearly the midfielder with the most talent we have in the team not something that we have to do or that even matters? Then my follow up question is are we sure that’s the best way to approach things?
He's had every opportunity to perform on the world's biggest stage in this league , maybe he needs a change of agent , a change of club , but more so he needs to change his own mindset.
It's really up to him what level he can achieve , no one else can do that but him.