Executive producer on The Last Guardian, Yoshifusa Hayama, has left Sony for London-based social games company Bossa Studios.
Alongside his EP role on TLG, as well as work on ICO and the Final Fantasy series, Hayama was more recently a VP at Sony Computer Entertainment for four years.
He'll now join Bossa as its creative director.
"The future of gaming is definitely online and thanks to recent developments with Flash 11, there is no reason why a social game can no longer be as visually stunning and as compelling as the big console titles," he said.
"Together at Bossa we have plans to bring a plethora of games to Facebook and eventually other appropriate social media channels, which include 3D elements and can be enjoyed by all age and interest groups."
Hayama's departure from Sony comes after it was rumoured last week that Team ICO head Fumito Ueda had left the studio, but would continue work on The Last Guardian in a freelance capacity.
Ueda tweeted earlier this week that work on Guardian was continuing, but didn't address rumours of his departure.