PRWeek understands that the company sent out a brief to a long list of agencies last week.
There is currently no PR agency working on the Harvester brand.
Jo Hudson, head of PR at Mitchells & Butlers, who is overseeing the process, said: "This is a really exciting time for the Harvester brand and we’re looking forward to seeing what creative ideas the PR agencies come up with for our campaigns. We’ll be reviewing the submissions over the next few weeks and will be commencing activity shortly."
Mitchells & Butlers also operates All Bar One, Toby Carvery, O'Neill's and Browns.
There are more than 175 Harvesters across the UK, with plans to expand the brand into retail and leisure parks.