ICA Gruppen is rolling out a new upgraded e-commerce platform for customers and stores, and is also starting up a highly automated so-called dark store - a facility that fulfils solely online orders.

"It is estimated that the new online solutions for ICA Sweden will have a margin effect of approximately -0.1% in 2021 and less than -0.1% in 2022," it said in a statement ahead of presentations to investors and media later in the day.

(Reporting by Anna Ringstrom; editing by Johannes Hellstrom)