Arsenal have already accepted that Mesut Ozil will not sign a contract extension with them thus they have reluctantly decided to cash in on him instead of losing him for free once his contract expires in the summer.
Manchester United boss Jose Mourinho is interested in moving the German international after coaching him at Real Madrid.
The pair has a good relationship and it is believed that Mourinho will get the 29-year-old in the next transfer window.
Another Arsenal star who wants to opt out is Alexis Sanchez who may also be sold for £30 million if Manchester City will show interest again in January.
Arsene Wenger, on the other hand, would prefer a swap deal with Sanchez and Paris St-Germain midfielder Julian Draxler as he does not want another one of his key players to move to a competitor club.