Jan 23 (Reuters) - Walgreens Boots Alliance is exploring a sale of specialty pharmacy company Shields Health Solutions, Bloomberg News reported on Tuesday, citing people familiar with the matter.

The sale could be valued at more than $4 billion, the report added.

Walgreens did not immediately respond to a Reuters request for comment. (Reporting by Surbhi Misra in Bengaluru; Editing by Rashmi Aich)