Eddie Jones has warned a small contingent of England's Grand Slam-winning side they risk losing their place for the tour of Australia.
The head coach has been disappointed by the performances of certain individuals since returning to club action on the back of a triumphant Six Nations campaign.
Jones will not accept any complacency and insisted sub-par displays ahead of the trip to the southern hemisphere in June could prove costly.
"Personally I've been disappointed in three or four players who have gone back [to their clubs] and played quite poorly," the Australian told the BBC. "Those players have put their tour place to Australia in jeopardy.
"Some might have little injuries, and some of them have agents or the media in their ear telling them how good they are. They have just got too far ahead of themselves.
"We should be happy, but we have also got to be quite aware that we have got to keep improving. Some of the players have been told directly, some of them have been told through other sources.
"But they will get the message. We'll see on the rugby field - 80 per cent [are playing well], 20 per cent are not, so there could be 20 per cent change in the tour squad."
Former rugby league star Ben Te'o is contention for a place on the tour, with a forthcoming move to Worcester Warriors and a mother with English heritage making him eligible.
However, with his contract not set to start until July 1 - and England three-match series down under beginning on June 11 - he will need to be declared available by the Rugby Football Union (RFU).
"He has to be eligible, and that will be decided between the RFU and the clubs. If he is eligible then he is definitely in contention because he's a good player," said Jones. "He can carry through the line, he can pass, he's a good defender.
"He's made a decision to play for England. [Discussions over his eligibility] are moving in the right direction."
Great Britain rugby sevens coach Simon Amor has said he would be open to selecting players from the 15s code for the Rio Olympics.
Jones revealed one player has expressed an interest, but made it clear he will only release a fringe player.
"I have spoken to one player. He was very enthusiastic. It's a back, but we won't go any further than that," added the Australian.
"If I think they are a borderline player for us, and there is a great opportunity to play in the Olympics, then I would allow that player to go - if I don't think he is going to play in the Tests against Australia."