you won't get 70m with him out of contract next summer and if he doesnt' want to extend, you have to sell him this transfer window. You can't have him going into the season out of contract and a free agent come january as it would be too big of a distraction. Also, he isn't the guy that is going to make the difference between us finish inside the top four or not.
There is literally a report just above my post where there is discussion for less than €80m which is around £70m. It is hardly going to be a distraction any more so than what the distractions he normally brings. He is world class, of course he can make the difference.