Reina could begin the season as third choice.
The veteran said, "Donnarumma and Plizzarri still have many years ahead of them. They're only 20 years old, so the future of Milan isn't in any doubt.
“We need to put fuel in our legs and adapt as soon as possible to the Coach's system. More than results, we need to focus on performance.
“We want to improve on last season and go to the Champions League."