Simon, 60, will miss the final live after his horror crash on an electric bicycle that broke his back in several places.
Piers served as a judge on BGT from 2007 to 2010 alongside Simon and Amanda Holden, until he was replaced by David, 49, when he moved to the United States.
He now has a 5/4 rating to replace Simon this year, as Jessica O’Reilly of Ladbrokes put it: “Piers is the perfect fit to replace Simon for the rest of Britain’s Got Talent later this year. ”
Meanwhile, Cheryl’s odds are at 2/1, with Jessica revealing, “We can’t rule out Cheryl being drawn away from the vacant potential to be judged strictly by Simon’s megabucks. ”
Piers and David made no secret of their aversion to each other, Piers having once said that David “crawls his skin.”
He also claimed the show’s ratings dropped when he was replaced by David, tweeting, “Funny that @davidwalliams” likes “the meanest tweets about me regularly, he’s a sneering toad. ”
“It’s not my fault @BGT ratings were so much higher when I was in your chair Dave!
David’s comedy partner Matt Lucas stepped in to defend him, writing to Piers: “Purely objectively – 1) He was probably polite. Some people are.
“2) Bragging about BGT’s ratings and popularity when you were briefly on it to someone who not only transformed the series, but is still the country’s best-selling author, didn’t work. ”
Piers’ poisonous response was, “Hi Matt, I don’t think it’s’ polite ‘to be friendly with people in person but poisonous behind their backs – it’s cowardly.
“As for BGT, I was very proud of it for the first 4 years, when the ratings exceeded 20 million.
“They are now half. Not a boast, just a fact. ”
MirrorOnline has reached out to a representative of Britain’s Got Talent for comment.