The tourism body invited agencies to submit applications on the government and utilities tender website, OJEC, this morning.
Its roster agencies include Wieden & Kennedy, Partners Andrew Aldridge and Starcom.
The review will be split into a three-stage process, with agencies expected to partner other agencies for the second round of pitches.
The review is expected to be overseen by Gillian Berntsen, UK head of marketing, who earlier this year beefed up the body's PR expertise with the appointment of Focus PR and Freshwater UK.
The move was prompted by a merger between VisitWales and the Welsh Assembly last year.
This article was first published on brandrepublic.com