With Gigio Donnarumma not renewing his contract, which expires on June 30, 2018, Milan directors have a future to stabilize. The decision not to renew leaves the door open for Real Madrid and PSG to prepare a mega-offer for the outgoing Milan goalkeeper. The back to back Champions League winners may be the only club to tempt the player.
There are now 2 options: wait until Donnarumma's contract expires on June 30, 2018 and leave on a free transfer or start negotiations which Milan between now and August 31st. Real Madrid want Donnarumma and they are evaluating their options.