The pair, who were among the co-founders of St Luke's when it launched in 1995, will report directly to the Euro RSCG creative director, Nick Hastings. Hastings said: "As well as being thoroughly good blokes, Colin and Seyoan are very smart and very talented. I feel absolutely sure that they are going to thrive here."
Before they helped to found St Luke's, Lamberton and Vela were employed for a year at Chiat/Day, following a spell at Lowe where they worked on campaigns for Smirnoff, Heineken and Vauxhall among others.
While at St Luke's, they were involved on the Ikea, Eurostar, Teletext and Travelocity accounts, as well as winning pitches for the Electoral Commission and Department for Education and Skills' Adult Literacy business.
Their most well-known work includes the former Manchester United football player Eric Cantona philosophising on Eurostar and the "let's go contimental" campaign, also for Eurostar.
"Soundtrack to the weekend", which they developed for Radio One, and their work for the New Deal, were also well received.
Lamberton said: "St Luke's is a great agency and it needed to take a real opportunity for us to leave. There's going to be a lot of energy at the new Euro RSCG with some great brands that deserve great work."