If you're talking professional, there are at least 100,000 professional football players in the world

https://colors-newyork.com/how-many-professional-footballers...

There's fewer than 10,000 professional Tennis players, and that's far more popular professionally than squash and other racquet sports so at a professional level you're talking more than 10 times football than tennis.

https://tenniscreative.com/how-many-people-play-tennis/

For non-professional, Based on 2019 data, 87 million play tennis worldwide, and far fewer squash players (20-30 million)

https://squashezine.blogspot.com/2012/07/how-many-people-pla...

But them together and you're less than half of the 250 million football players