Agencies have been contacted directly by Porsche's marketing department and initial meetings are due to take place at the end of this month.
The successful agency will be responsible for launching a major online campaign to help promote the Porsche Cayman. The brief is expected to cover online banner ads, digital videos and web design work.
Porsche views the Cayman, a mid-engined two-seater sports car, as its "best-kept secret", but now wants to promote the model to a wider audience.
It also wants to raise awareness of the new Cayman R, a lighter and more powerful model that was introduced to the market earlier this year.
Porsche has previously shied away from investing in digital advertising activity, instead focusing the bulk of its marketing budget on press and direct marketing campaigns.