PARIS (Reuters) – E-commerce giant Amazon and French retailer Casino are expanding their partnership, with Amazon installing pick-up lockers in Casino stores and making more of the French company’s products available on Amazon.

The move, which follows an initial co-operation between Casino’s upmarket Monoprix supermarket chain and Amazon in Paris, could re-ignite speculation of a bigger deal later on.

An Amazon spokeswoman said it had a policy of not commenting on market speculation. Amazon’s purchase of bricks-and-mortar U.S. food retailer Whole Foods Market last year has raised speculation it could buy a European food retailer.

The extended partnership comes as Casino is selling assets and cutting debt to try to allay investor concerns over its finances and those of parent company Rallye.

The deal, unveiled