Tory insiders said that leader David Cameron would increasingly be relying on Coulson, following this week's news that Hilton is relocating to the US.
This summer, Coulson will assert his control over the party by enforcing a strict 'grid' system that will ensure stories are regularly fed to the media and that telegenic Tories are constantly available to be interviewed.
The grid system will see the party taking a much more disciplined approach to media management than was the case last year, when Cameron was hit by a wave of negative coverage surrounding issues such as floods and grammar schools.
A Tory insider said: 'Vacuums lead to problems, as we discovered last summer, so there will be no holiday this summer. There will be a summer assault. There will be a grid in place. It will be strategically planned so the right people are around.'
The source added: 'We are planning to fill up the grid on a daily basis, so when Cameron and (shadow chancellor George) Osborne are not around, you'll see some of the smaller hitters out, such as Peter Ainsworth and Eric Pickles.'
The Conservatives have insisted that Hilton will still remain in his post as director of strategy after relocating to the US, despite being 6,000 miles away from his leader. He is expected to return to London after six months. But public affairs agency bosses said Coulson would become more powerful.
Weber Shandwick public affairs chairman Jon McLeod said: 'Coulson's influence will grow. We can now expect a new phase of process that is more focused on the daily cut and thrust of opposition politics while preparing for government.'
Open Road CEO Graham McMillan said: 'Coulson will privately be pleased that Hilton will be forced to take more of a back-seat role.'