Details of Delphi participants
| Participant data | Round 1 n=18 (90.0%) n, % | Round 2 n=17 (85.0%) n, % | Round 3 n=18 (90.0%) n, % | |||
| Professional background | ||||||
| Medical doctor | 3 | 16.7 | 3 | 17.6 | 3 | 16.7 |
| Physiotherapist | 15 | 83.3 | 14 | 82.4 | 15 | 83.3 |
| Experience in professional football | ||||||
| 1–5 years | 4 | 22.2 | 3 | 17.6 | 3 | 16.7 |
| 6–10 years | 9 | 50.0 | 9 | 52.9 | 11 | 61.1 |
| 11–15 years | 1 | 5.6 | 1 | 5.9 | 1 | 5.6 |
| 16–20 years | 3 | 16.7 | 3 | 17.6 | 2 | 11.1 |
| 21–25 years | 1 | 5.6 | 1 | 5.9 | 1 | 5.6 |
| Level of play | ||||||
| Premier League (consists of 20 clubs) | 8 | 44.4 | 7 | 41.2 | 8 | 44.4 |
| Championship (consists of 24 clubs) | 6 | 33.3 | 6 | 35.3 | 7 | 38.9 |
| League One (consists of 24 clubs) | 3 | 16.7 | 3 | 17.6 | 2 | 11.1 |
| League Two (consists of 24 clubs) | 1 | 5.6 | 1 | 5.9 | 1 | 5.6 |