There are even studies linking soccer ("football") to an increased risk of dementia. One large study found that the risk was highest among defenders (who tend to head the ball most frequently) and lowest among goalkeepers (who rarely do.)

That study stopped short of establishing a link to CTE specifically, which can only be definitively diagnosed postmortem. But smaller autopsy studies have found CTE in former soccer players.

We focus a lot on Boxing and American football, but I suspect the risk of CTE is far more widespread across sports than is talked about (every concussion, hard contact, head impact, etc all add up)