Barkley’s defensive discipline was often questioned in his younger years, with the England international seemingly only interested in going forward.
However, the 22-year-old has shown a far greater willingness to track back for his team this term, and Barkley has revealed that Martinez has been a great help in this department.
"I have been working on that,” he said.
"I've been getting a lot of help from the manager on that, thinking about that side of the game.
"When he first came to the club, my thoughts were just about getting forward but now I've got more responsibility on the pitch and I've got to sense danger, as well as going forward.
"I've got to help defensively.”
Martinez is often accused of showing no consideration to defending, but he has clearly helped Barkley to develop in his time at Goodison Park.
The Spanish boss was the first Toffees’ manager to give Barkley a run of games in the first-team, and he has been rewarded for his faith.
Barkley now appears to be one of the most dangerous midfielders in the entirety of the Premier League, and he has added end product to his game this term.
Barkley has scored 11 goals and claimed eight assists in just 31 appearances in all competitions, and he has established his place as one of the main creative figures in Everton’s line-up.