Can you please explain which one is suitable?
Did you watch the football yesterday?
Or
Did you watch football yesterday?
I think definite article(the) is suitable here because this is specific not a general thing
Did you watch the football yesterday?
This sentence means:
Did you keep your eyes on the football yesterday (to make sure that it wasn't stolen).
In other words, it's talking about the object the football—the oval thing that you throw to somebody else.
If you're talking about what you see on TV, you can use either:
Did you watch football yesterday?
Or:
Did you watch the football game yesterday?