The plunging pound is set to see Premiership clubs shopping more within the UK this January.
"The party is over," one leading French-based agent told The Times.
The agent told The Times last night: "It used to be simple. As a rule of thumb, if a player earned 100 in France, you could be sure he could get £200 in England, maybe more. Well, now that £200 is worth 200, so all of a sudden it's not as attractive.
"And then there are the transfer fees. An English club might be willing to spend £3 million on a central defender and, for that money, you could get a good solid pro, because it was 4.5 million. But now, £3 million is 3 million. And you can't get the same quality for that amount."