A spokesman for the supermarket behemoth confirmed to PRWeek that the reduction in roles would affect "all areas of head office", including comms.
The spokesman declined to comment on current number of PR and comms staff employed by the firm.
A statement from the Hertfordshire-headquartered retailer, sent to media and staff, said: "This is a significant next step to continue the turnaround of the business. This new service model will simplify the way we organise ourselves, reduce duplication and cost but also, very importantly, allow us to invest in serving shoppers better.
"We have made good progress so far in our turnaround but we have more to do. We will work with colleagues to support them as we go through this important transition."
The firm took on Coca-Cola's Jane Lawrie as group comms director in October last year, with Lawrie arriving the same week of Tesco's high-profile spat with Unilever over the price of Marmite and other products. Tesco continues to work with the agency Teneo Blue Rubicon, which has also worked with Coca-Cola.
The retailer lost its head of EU and international government relations John Timothy in April.
This month, it announced like-for-like sales growth of one per cent in the first quarter of its financial year, its sixth consecutive quarter of positive growth. It made a loss of £54m in the year to 25 February.