This is an exploratory observational study.

Video footage is used to review all 64 matches in the football tournament.

All players actions are registered using the FIFA football language, such as, pass completed, clearance, etc.

Potential injury incidents are registered, and for each incident the injury location, contact type, player reaction, velocity, location, game reaction, referee reaction, medical staff on pitch, and outcome (e.g. substitution) are also registered.

Video footage is used to review all 64 matches in the FIFA World Cup Qatar 2022.

All players actions are registered using the FIFA football language, such as, pass completed, clearance, etc.(https://www.fifatrainingcentre.com/en/resources-tools/football-language/index.php)

Potential injury incidents are registered, and for each incident the injury location, contact type, player reaction, velocity, location, game reaction, referee reaction, medical staff on pitch, and outcome (e.g. substitution) are also registered.

Simple descriptive statistics are used to create overviews of the outcomes described above, including comparisons between actions which do or do not lead to potential injury incidents.

A secondary analysis may be performed including injury diagnoses, if players consent as part of another study on injury surveillance allowing video analysis of their injuries.

No a priori sample size calculation was performed, as all potential injury incidents are included.

Inclusion Criteria:

• All participating football players at the FIFA World Cup Qatar 2022.

Exclusion Criteria:

• None

The tournament includes 32 national teams, and each team is allowed to select 26 players, giving at total of 832 potential participants. In total, 64 matches will be played over 29 days.