The FMCG giant is believed to have handed the account to Wunderman as part of a strategy to step up its digital marketing activity for Pringles.
Last year P&G expanded its pan-European digital creative roster in preparation for a boost in its online adspend. The company approached UK digital agencies with offices in multiple European territories with a view to adding at least one to its roster.
The FMCG giant initially compiled its digital agency roster in 2006, selecting Agency.com, LBi and Saatchi & Saatchi to work on digital projects.
According to Nielsen Media Research, P&G has spent £108 million on advertising so far this year, of which £855,000 was spent online.
A spokeswoman for Wunderman said: "We can't comment on rumours about account moves from other agencies."