They are only metaphors in the eye of the beholder.
Let's say, hypothetically (Although, if this brief interaction is anything to by, hypotheticals and hypotheses ((Yes. Before you chime in with yet more Gramnar Nazisms, "hypotheses" is the plural of "hypothosis")) ect, may go over your head) a non-football reads someone remarking that "Paul Pogba is a virus". Said persons might batton down the hatches and brace themselves for, what they assume, is the new variant of Covid-19.
Terrified and scared that the world will be cast in another pandemic, and that quarantine is going to be a requisite, they lose all hope and go all Sylia Plath and stick their head in a gas oven
Or if that same non-footballing person reads someone saying "Paul Pogba is a leech". Said person might think nothing if it, save for being a wee bit confused why anyone would make such a weird and random declaration about a pet.
But fine, you knew exactly what i meant when i said that Paul Pogba siphoned £200m+ out of the United coffers. Everyone did. But I'm too quick to assume. Are you a football fan? Do you know who Paul Pogba is?
If your answer is "no" to either of those questions, especially the first one, then please accept my most humble smd genuine apology.
However, if your answer is "yes" to either, especially to the first one, then you're clearly just being a procative little pedant. Sadly, i can't help you with that.
But fine. Since you're clearly traumatised by my off-the-cuff phrasing (The phrase wasn't actually delivered "off my cuff". It's just an expression that the phrase was said on a whim.)
How about if I use "Paul Pogba has siphoned £200m+ from Manchester United" as an idiom?
The way that I said it, it would easily fall into the category of an idiom.
If you need any help: an idiom is an expression or a phrase that shouldn't be taken too literal, as it's commonly used to represent a metaphor.
Let me know if that helps.