West Brom youngster Mulumbu: Chelsea midfielder Essien best in world
Mulumbu says the Chelsea star is the benchmark for all Premier League midfielders.
"At the moment Essien is the best in the world and I have to step up my game like him," Mulumbu told the WBA website.
"I have to step up my game to go forward and be like Essien, going from box to box.
"That is the next level for me and that is why I believe I am still learning."