The veteran jumps jockey has been out of action since suffering a broken leg in a fall at Listowel in September, but had been closing in on a return.
However, Carberry fractured the same leg when riding out at his home on Friday and will remain on the sidelines when the showpiece meeting at Prestbury Park takes place in March.
He said: “I was due to see the specialist at the end of January and the plan was he was going to pass me fit.
“I’ve been riding out for a while and we’d been happy with how things were going. It (a comeback) was getting close, but obviously it wasn’t meant to be.
“I was riding out on Friday and it was a simple enough fall. The horse just spooked and when I went down the leg gave way — there is obviously a weakness there, but it’s not the same break as last time.
“I’ll see the specialist later on, but I’d say this will set us back a couple of months, which is disappointing.”