Everton midfielder Ross Barkley has been told to improve in possession if he wants to retain his starting spot in the Toffees engine room.
The 22-year-old England international was replaced at half-time of the 3-0 win at Sunderland on Monday evening, with Spanish winger Gerard Deulofeu taking his place.
And, with Barkley off the pitch, the visitors scored three times in 11 second-half minutes to secure a comfortable victory at the Stadium of Light, leaving head coach Ronald Koeman with a decision to make for the visit of Middlesbrough on Saturday.
The Dutchman has confirmed that veteran Gareth Barry will start and made his 600th Premier League appearance, but was far less certain about whether Barkley would retain his place in the starting XI.
He told reporters: "There was a reason to take Ross off at half-time – he didn't play well lost too many balls, players of that quality can't lose those kind of balls.
"I had a talk with Ross, he needs to improve and we will see at the weekend. He understands, we showed him the clips and there is no escape.
"You look to his qualities, he needs to be the key player between defenders and strikers, in a position to create and defensively be part of a team – in all aspects he can and needs to improve."
Everton go into the game against newly-promoted Boro with ten points from four league games played so far this season, having followed a 1-1 draw with Spurs with victories over West Brom, Stoke City and Sunderland.
They are priced at 13/20 to earn all three points on Saturday and are 15/2 to win the game 2-0, with Romelu Lukaku 20/21 to score at any time after netting a hat-trick against the Black Cats.
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