Tottenham veteran William Gallas feels Steven Caulker can become one of England's best defenders.
The pair impressed in victory at Manchester United on Saturday.
"I'm sure he'll be one of the best in England if he works hard," said Gallas, quoted in the Daily Star.
"He did well against United and what I like is that he listens.
"He is focused. He is not afraid to play football or to go forward and that is fantastic for him."