The Hatters boss spoke on the ex-Wycombe Wanderers man following Luton's win over Hull City at the weekend, saying: "As soon as Fred starts getting to the levels we want him to be then he’ll be frightening.
“If you think he’s good today, he’s nowhere near, fitness-wise he’s nowhere near, sharpness nowhere near, productivity and work-rate, nowhere near today, he’s a mile off where we need him to be.
“I’ve said to him, you look at Harry Cornick.
"Harry Cornick does 90 minutes, week in week out, Saturday, Tuesday, Saturday and produces and that’s the levels we want Fred to do, as that’s why Fred’s here.
“If Fred can do that, we’ve got some specimen, some quality player, but he needs now to get to the Luton way because I feel he’s been allowed to float through certain things, get away with stuff with his pace.
“But he’s not relentless, you don’t see him time after time after time after time, he’s not Ryan Giggs and (Andrei) Kanchelskis, how they used to be and that’s the level he’s got to attain.”
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“I’ve said to him, you look at Harry Cornick.