Citigate will initially raise awareness of WhiteConcierge in the UK, French, German and Iberian markets through its agency network, with plans to extend the comms brief into new markets later this year.
'With the introduction of compulsory bank charges and other regulatory changes, banks and other corporates will be looking at ways to retain customer loyalty,' said WhiteConcierge MD Jonathan Breeze.
'We expect the global concierge market to grow and are delighted to work with Citigate to develop a multi-market comms programme.'
The agency was appointed after a four-way competitive pitch.
WhiteConcierge provides white labelled or branded services, primarily to corporate customers.
The firm gained coverage last week when it estimated that a one-night trip to the Champions League final in Moscow will cost a minimum of £2,000.
The firm has its own two-night private-jet package for £31,600.