Morrisons (LON:MRW) is to help US web retailer Amazon (NASDAQ:AMZN) to expand its online grocery service in the UK.
And the UK supermarket chain has also extended its distribution deal with Ocado (LON:OCDO), which has been talked about as a possible takeover target for Amazon.
Morrisons said it had agreed a wholesale supply arrangement under which it would supply hundreds of its ambient, fresh and frozen products to Amazon Prime Now and Amazon Pantry customers.
Morrisons chief executive David Potts said: "This is a low risk and capital light wholesale supply arrangement that demonstrates the opportunity we have to become a broader business.
"We look forward to working with Amazon to develop and grow this partnership over the coming months."
Morrisons also said it had done a deal with Ocado to expand its online operation by taking space in Ocado's new distribution centre in Erith in south-east London.
The Bradford-based supermarket group said it would also involve Ocado being able to pick goods from Morrisons stores, enabling Morrisons.com to sell to customers throughout the UK
Morrisons was previously thought to have had concerns that Ocado's relative lack of presence in northern England and Scotland was limiting the former's ability to develop a nationwide online service.
Potts said the amended deal was subject to detailed terms being agreed and would only proceed if it enabled Morrisons to achieve profitable growth online.
"There can be no certainty that an agreement will be concluded," he said.
The news follows market speculation last month that Amazon was considering a potential takeover approach to Ocado as a way of offering a full-blown grocery delivery service in the UK, over and above its existing Pantry service.