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Pfizer, Allergan in final innings of all-stock deal: Sources

Pfizer and Allergan are in the final stages of discussions to merge, sources told CNBC on Thursday.

The companies are not expected to announce a deal on Monday, as has been rumored. Instead, the announcement is expected to come the following Monday after the Thanksgiving Day holiday.

It is expected to be an all-stock deal of a little more than 11 shares of Pfizer for each share of Allergan.

The companies are awaiting guidance from the Treasury Department before moving forward with a deal, sourced said.

CNBC's David Faber contributed to this report.