I would suggest this a bit of a stretch.
If the player is agreeable but no deal with the club is in place then I’d put the figures the other way round. 10% done. No way are the Arse going to roll over on this. Also no way would they agree to sell him while at the same time signing up Wenger for 2 more years. The Wenger thing would come first then they would look at any offer for AS. I would expect this would only happen with a very public and drawn out scrap similar to the Sterling scenario where every ex Arse player from the last 40 years would get hauled out to call him a mercenary twit before they eventually take the cash and declare Danny Welbeck a better player!
I will be amazed if this goes down any other way.
Arsenal wont keep him against his will and everyone knows it so they have no choice.
Sam Lee, Tolmie...all the ITK's infact are suggesting Sanchez will be done. The people who are telling them that wouldn't be if the club weren't also convinced it was done.