England head coach Eddie Jones has warned that no-one's place in the side is assured ahead of the summer tour to Australia.
Jones began his England reign in style by guiding the Red Rose to a first Six Nations Grand Slam since 2003, having already clinched the championship for the first time in five years with a game to spare.
However, the former Wallabies coach has insisted that the Grand Slam is just the beginning of his plans for the team, and challenged them all to continue improving individually if they are to keep their place in the side.
"All 15 places in the team are up for grabs. Everyone's got to keep improving. Billy Vunipola has got to keep improving, as good a player as he was in the Six Nations. If he comes back and he's not in good physical condition, he's not mentally good, he's not going to be in the team," Jones is quoted as saying by PA.
"If you look at the benchmark of world rugby, the All Blacks, why did they consistently improve over eight years to win the World Cup twice? Because their players kept improving individually. And that's the challenge for these players. To win a Grand Slam is just a start. To keep improving is the challenge.
"Everyone wants the players to do well. We want the players to go back to their clubs and play like international players and be outstanding for their clubs. That'll make them better when they come into consideration for the Australia tour."
Jones will take the Red Rose back to the country of his birth in June.
