The Bishop of Winchester has called for measures to stop sex workers being trafficked into the south for the 2012 Olympic Games.
The Right Reverend Michael Scott-Joynt led a debate at the General Synod where he called on the government to make sure effective measures were in place.
He also urged the Church of England to support work to end human trafficking.
The 2012 Olympic Games will be held in London and the sailing events in Weymouth and Portland in Dorset.
Bishop Scott-Joynt said: "The particular anxiety about the Olympics arises because of the experiences, which are well documented, in Germany in the run-up to the Football World Cup in 2006 when it was estimated that three million fans would buy sex while at the world cup.
"People made every kind of arrangement - as if it was like selling chocolate - to feed the needs of the men they expected to come and want to use women.
"Among [the arrangements] was trafficking of women and girls from poor areas, both in Europe and elsewhere in the world."
Det Supt Steve Bartlett, from Dorset Police, said: "Our Olympic planning includes planning for a whole range of potential serious organised crime that could come to the area, and that does include human trafficking.
"We do know that in Dorset we have had incidents of potential human trafficking.
"So we have to prepare for the fact that with a vast influx of people into the area, and based on the experience of other similar large events across the world, there is the potential for an increase in human trafficking."
The Home Office said it had invested nearly £6m in direct support for trafficking victims.