(Reuters) -Warner Bros Discovery ( WBD ) has asked potential buyers to submit improved offers by December 1, Bloomberg News reported on Tuesday, citing people familiar with the matter.

The parent of HBO and CNN last month said it was exploring its options for sale. Since then, it has received preliminary buyout bids from rivals Paramount Skydance, Comcast and Netflix.

After reviewing any improved offers, Warner Bros may enter a period of exclusive negotiations with one of the companies, Bloomberg News reported.

Warner Bros Discovery ( WBD ), Comcast, Netflix and Paramount Skydance did not immediately respond to Reuters requests for comment.