Everton manager Ronald Koeman believes Romelu Lukaku needs to improve his workrate if he wants to become a "top striker."
Lukaku, 23, has impressed for the Toffees this season, having scored seven goals and registered four assists in 11 appearances.
However, Koeman believes the Belgium international can still better himself as a forward by working harder for the team.
"I understand it is difficult because we need to press more and they need to change their attitude -- like Romelu," Koeman told a news conference.
