June 1 is a significant day on the calendar for the NFL, as it is the day when further reshuffling of rosters tends to happen.
After June 1, some of the clauses in players’ contracts for automatic restructuring of the deal trigger, resulting in the financial savings of moving on increasing substantially. This gives teams time to explore other options, keeping highly-paid players on their roster as placeholders before giving them the flexibility to move on if they reach a solution. For teams in need of salary cap relief, June 1 is when they can move on from players occupying a large portion of their cap space.