The British Home Office has said six Iranian men have been found on a beach in Kent.
Border Force officials were called at 7.30am and detained the men who were handed over to be processed by immigration officers after receiving a medical assessment.
French Interior Minister Christophe Castaner said he had spoken by phone with British Home Secretary Sajid Javid about the spate of attempts by migrants to cross the English Channel.
Writing on Twitter, Mr Castaner said: "In touch with my British counterpart Sajid Javid.
"We are co-ordinating to strengthen our actions to combat Channel crossings undertaken by certain irregular migrants on small boats, at peril of their lives."
Mr Javid is under pressure to "get a grip" on the issue of migrants attempting to cross the English Channel amid criticism over the government's response.
He has cut short his Christmas break and is returning to Westminster to deal with what he described as a "major incident" unfolding in waters off the south coast of England.
The Home Secretary has promised to do more to tackle the issue, saying it is of "grave concern" that people are attempting the perilous crossing.
However, in the face of calls for more Border Force Cutters to be deployed in the Channel, he said it was "vital we strike a balance between protecting them and protecting our borders" - and avoid encouraging more people to take the risk.