General Growth Properties CEO Sandeep Mathrani mentioned Amazon's bookstores in response to a question about mall traffic in an earnings call with analysts on Tuesday, according to a Wall Street Journal report .
"You've got Amazon opening brick-and-mortar bookstores and their goal is to open, as I understand, 300 to 400," Mathrani said.
The Journal reported that it was not clear where Mathrani got the potential number of stores. The news agency added that the CEO may have discussed plans with real-estate executives.
In November, Amazon opened its first brick-and-mortar store in Seattle. Described as a "physical extension of Amazon.com," Amazon Books offers titles that have been chosen based on the e-commerce site's own customer ratings and sales.
Amazon has promised that literature sold at Amazon Books will not differ in price from its online price tag.
Amazon reported a huge miss on fourth-quarter earnings last week. The online retail giant reported EPS of $1 per share versus a Thomson Reuters consensus estimate of $1.56 per share.
—CNBC's Alexandra Gibbs contributed to this report.