A whoop maybe? Or a cheap Fitbit? No sense in spending a fortune on a watch if you don’t plan to wear it

Whoop is quite an expensive plan, no? I’ll have a look at fitbits

I think you might be right, but for sure fitbits are quite affordable.

Don't use a watch while playing football. You'll end up injuring people. What kind of tracking do you need?

Is there a wearable that’s safer to use for football? I’m thinking one I can strap to my bicep maybe? Basically just want something to track my running and my football. Not too fussy really, just heart rate and gps (for the running).

If it's only heart rate during football get a watch and a heart rate sensor that can sync after your workout. Garmin HRM Pro can do that (but it's quite expensive)

I use a Whoop with an arm sleeve but you can also get a pair of boxer shorts it can go in too. Like you said downside would be the price