Yesterday, 39-year-old Holly was absent, and her replacement Alison Hammond explained she was having a "well deserved day off".
Today, Phillip explained Holly was having another day off and would be back on Monday.
One said: "Where's Holly? Is she ok?"
While another wrote: "What's happened to holly? They said a break but just come back off holiday back on Monday?"
"Where's Holly???", questioned a third.
Phillip and Davina continued to host the popular ITV show, but viewers didn't stop asking why Holly was off work all of a sudden.
One tweeted: "Holly’s having a day off? She has Friday, Saturday, Sunday off every week and every school holiday. Why not just say somethings going on she’s got personal reasons?? What other reason would she be off 2 days on the bounce? Hope she's ok?!"
"Something they aren’t telling us about Holly. I hope she's ok", penned another viewer watching the ITV programme.
Yesterday, presenter Alison Hammond replaced Holly and hosted the show with Phillip, amid reports she's taking Ruth Langford's place on Friday episodes of This Morning.
It's been claimed Ruth and her husband Eamonn Holmes have been axed from their Friday slot, and are being replaced by Alison and Dermot O'Leary.
A spokesperson for This Morning told Metro.co.uk: "We have a stellar presenting line up on This Morning in Holly and Phillip and Eamonn and Ruth.
"Any additions to this line up will be announced in due course."
This Morning airs weekdays at 10am on ITV.