Walker said: "This season he has been nothing short of first class. That is the standard he sets for himself and we set for him. It is the standard he needs to keep up now.
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"When he comes in on his left foot we call him the sniper because he likes to shoot. When he comes in on the left foot you know he has the calmness and composure to pick his spot.
"We lean on him. We need important players like him because they help you win games.
"He puts the work in, he is always doing extra shooting. His goals are coming in, he is reaping the rewards and he needs to keep these standards up."