Co-op customers should see stocks on shelves start to return to more normal levels this weekend, the company said, after it announced it was switching its online ordering system for suppliers back on after a cyber-attack.
The hack resulted in payment problems, widespread shortages of goods in shops, and compromised customer and staff data.
The criminals, using the cyber crime service DragonForce, also claim to be responsible for a similar attack on Marks and Spencer (M&S) and an attempted hack of Harrods earlier this month.
Co-op said it was bringing its systems "gradually back online in a safe and controlled manner."