Named Shamu (killer whale), the new Nexus phone will be larger than Apple's iPhone 6 Plus (5.5 inches) and Samsung Galaxy Note (5.7 inches), US daily reported.

Motorola Mobility, the phonemaker that Google is selling to China's Lenovo Group Ltd, is reportedly manufacturing the phone.

Google also plan to release a new version of its Android mobile-operating system simultaneously.

In 2011, phablets accounted for 1 percent of the global smartphone shipments but this year, these devices will make up 24 percent of the market, according to a report by global consultancy firm Strategy Analytics.