Chelsea boss Thomas Tuchel sees Reece James' future as wing-back.
Tuchel has called on James to become a regular for the Blues by playing in 50 to 60 games a season.
But he insisted he still thinks the England star's best position is at wing-back despite recently deploying him on the right-hand side of a back three.
"I would love to have two Reece James," Tuchel said. "It is 50 per cent at wing-back and 50 per cent in the back three.
"It also depends on the opponent and the structure of their offensive transition - for Reece to be the first guy involved and not in the attack.
"I'm a bit more leaning that his very best position is the wing-back position but it is more demanding. The next step is to be a regular player for 55 or 60 fixtures."