The NFL concussion protocol has no fixed timeline. Players move through five phases of increasing physical activity, and they can only advance when symptoms clear at each stage. In practice, NFL players concussed during regular-season games miss a median of 9 days, though the average stretches to about 14 days because some players take significantly longer to recover.
The Five Phases of the Protocol
The NFL’s Return-to-Participation Protocol is built around five progressive phases. Each one raises the physical and cognitive demands on the player, and any return of symptoms at a given phase sends the player back to the previous one.
Phase 1: Symptom-Limited Activity. The player sticks to normal daily routines and introduces light aerobic exercise, such as 10 minutes on a stationary bike or treadmill at low resistance. The goal is simply to see whether light cardiovascular effort triggers any concussion symptoms.
Phase 2: Aerobic Exercise. Activity increases to 20 or more minutes on a bike or treadmill at moderate to strenuous intensity. Duration and resistance can be gradually raised over time as long as symptoms stay away during and after the workout.
Phase 3: Football-Specific Exercise. Cardiovascular work continues, and supervised strength training begins. The player can join team practice for sport-specific drills, but sessions are capped at 30 minutes or less. Medical staff monitor symptoms closely throughout.
Phase 4: Non-Contact Practice. The player participates in team meetings, conditioning, and full non-contact practice. Cognitive testing is compared against the player’s pre-season baseline scores. Advancing past this phase requires both symptom-free performance and baseline-level results on those tests.
Phase 5: Full Football Activity and Clearance. The team physician clears the player for contact in practice. If the player handles full-contact participation without symptoms and the physician determines the concussion has resolved, the player is cleared to return to games.
How Long Each Phase Takes
No minimum number of days is assigned to any single phase. A player who feels completely normal after Phase 1 could, in theory, move to Phase 2 the next day. But because each phase must be completed without symptom recurrence, and because symptoms often resurface once intensity increases, most players spend at least one to two days per phase.
The median of 9 days means that roughly half of concussed players clear the protocol in under two weeks. The gap between the median (9 days) and the mean (14.4 days) tells a useful story: a smaller group of players takes considerably longer, pulling the average up. Some concussions resolve in a week; others sideline players for a month or more, depending on severity, concussion history, and individual biology.
Who Makes the Clearance Decision
The team’s own physician runs the day-to-day evaluation, but the process isn’t entirely in the team’s hands. The NFL uses independent medical consultants who are not employed by any club. These unaffiliated neurotrauma consultants are present on game days and can flag a potential concussion in real time, pulling a player for evaluation even if the team’s staff hasn’t acted. Final clearance to return to games requires sign-off from both the team physician and an independent neurological consultant, creating a two-layer check designed to prevent teams from rushing players back.
What Happens When Teams Break the Rules
The NFL and the players’ union jointly investigate suspected protocol violations, and penalties can be steep. In a 2025 case, the New York Giants were fined $200,000 after head coach Brian Daboll and running back Cam Skattebo entered the medical tent and spoke with quarterback Jaxson Dart before his concussion evaluation was finished. Daboll was personally fined $100,000, and Skattebo was fined $15,000. The investigation found that neither person actually affected the medical exam, but their presence was deemed inconsistent with the protocol’s requirements.
These fines signal that even the appearance of interference is treated seriously. In past high-profile cases, violations have also led to changes in how the protocol itself is structured, with the league adding new safeguards after each controversy.
Why Timelines Vary So Much
Concussions are not uniform injuries. The force of the hit, the area of the brain affected, whether the player has had previous concussions, and even factors like sleep quality and stress levels all influence recovery speed. A player experiencing only brief dizziness after a collision may sail through all five phases in a week. A player dealing with persistent headaches, light sensitivity, or trouble concentrating could spend days stuck at Phase 2 or Phase 3, restarting each time symptoms flare.
Age and concussion history matter, too. Players who have sustained multiple concussions over their careers tend to recover more slowly, and their symptom patterns can be less predictable. The protocol is intentionally open-ended for this reason: it’s built around the individual player’s symptoms rather than a calendar.