The row first broke out when former Good Morning Britain host Piers and footballing legend Gary debated who was the best footballer of all time.
Piers, 56, is a huge fan of Cristiano Ronaldo, while Gary was singing Lionel Messi’s praises.
After Gary, 61, claimed Ronaldo and Messi were “both greats”, Piers responded: “It’s perfectly sensical, Jugs.
“Messi’s clearly lost his magic since leaving Barca. Ronaldo’s kept it at many clubs/countries incl back at United now.
To this, Gary simply responded with a screengrab of Piers’ pinned tweet, documenting an exchange he had with Ronaldo.
“‘You have good abdominals,’” it reads, alongside a photo of the pair together.
“Thank you, @Cristiano.
“Yours aren’t too bad either.”
As he reminded Piers about this post, Gary added: “Hmmmmm.”