O’Sullivan intends to combine playing snooker and pool over the coming months.
He will participate in snooker’s Grand Prix, as well as the UK Championship, The Masters and the World Championship as well as the Betfred Premier League.
However, he has yet to decide what other World Snooker events he might play in, if any.
World No.28 Robertson climbed 40 places in the world standings last season.
O’Sullivan’s signing means that the Stirling-based management group – which is also involved in football, golf, rugby, tennis, skiing, motorsport, bowls and horse racing - currently look after the top three players in the world rankings - O’Sullivan, Stephen Hendry MBE and Stephen Maguire.
O’Sullivan will also join up with Hendry, Maguire, Mark Williams, Ken Doherty, Marco Fu, Anthony Hamilton and Mark King as part of Team Highland Spring, who will be one of O’Sullivan’s main sponsors.
