I think that the management of Manchester United, for decent money, can release Martial in any of the strongest clubs. Let's see how it will be in the future.
There was a time the club would have let Martial to leave the club but seeing how well his fighting for his place in the starting eleven, a sale for Martial is definitely off the table as his instrumental to the club. Right now money isnt a big deal for Manchester United but football being a business a club that would be willing to break the bank might get him.
Looking at how rumors go I think there is a chance for A.C. Milan to make Antonio Conte as their manager, but looking at the current position of Conte now I doubt that he is willing to switch sides right now as he is doing a good job as Chelsea's manager. A.C. Milan's season is quiet a disappointement for many fans as they spent a massive amount in the transfer window yet they are not performing good even in their own league.
Antonio Conte is a smart manager, I don't not think he can leave a strong team like Chelsea for an A.C. Milan side I see to be struggling...I expect Conte to extend his contract and the good thing about rumours is they do not always turn out to be true.