This is a big season for Barkley, who has been hailed as one of England’s best young players since he burst on the scene in 2011.
But he is not a player of potential anymore and Koeman is expecting Barkley to take his game to the next level.
“He is one of the key players who is performing in an important position for the team,” said the new Toffees boss .
“He needs to create chances, score goals. But he also needs to show more responsibility in terms of the defending part of the team. That is one of the aspects in football where he can improve.”