ROBIN ROBERTS 'GMA' Planning A-List Subs While She's Gone

[gmadiane]

"Good Morning America" won't be left high and dry when Robin Robertsgoes on medical leave in a couple months -- TMZ has learned, producers are arranging a star-studded list of substitutes to sit in for her.

As we reported, Roberts was diagnosed in April with myelodysplastic syndrome -- a serious blood and bone marrow disease -- and has already begun chemotherapy treatment ... before her big bone marrow transplant in a few months.

As for who made the temp list -- we're told producers will approach Diane Sawyer, Charlie Gibson, Barbara Walters, Chris Cuomo, Connie Chung,Joan Lunden and others.  We're told each substitute will sit in Robin's chair for a full week, and each Friday the next star sub will be announced.

Given the nature of the operation, it could take Roberts 4 months to recover -- so the list will be long.

But here's the good news.  Robin, we're told, is in good physical shape and the condition was detected very early, so the prognosis is "very good" and she could be back much sooner than the 4 month estimate.

[gmadiane]

This is my morning show, I will miss her while she is gone

[MamaMandee]

That is cool. 

[taniamorse85]

I certainly wish her well.  My grandma had MDS, and because of her age, they couldn't do the BMT.  Instead, she had to do chemo until it progressed to AML, and she passed away.  It was truly brutal.  A BMT is a really rough process, but I'm glad she's got the chance to fight this disease.

[gmadiane]

Quoting taniamorse85:

I certainly wish her well.  My grandma had MDS, and because of her age, they couldn't do the BMT.  Instead, she had to do chemo until it progressed to AML, and she passed away.  It was truly brutal.  A BMT is a really rough process, but I'm glad she's got the chance to fight this disease.

so sorry about your grandma