Millwall boss Neil Harris is sweating over the fitness of three players ahead of the Lions’ trip to Chesterfield.

Star striker Lee Gregory and forwards Aiden O’Brien and Fred Onyedinma are all doubts for Saturday’s League One fixture at the Proact Stadium.

Gregory pulled up with a hip injury during last weekend’s narrow victory over Sheffield United while O’Brien and Onyedinma both hobbled off during the EFL Cup defeat to Nottingham Forest.

Central midfielder Calum Butcher could be handed his debut by Harris following his transfer move from Championship club Burton Albion.

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