Striker Le Fondre joined the Millers from Rochdale for an undisclosed fee earlier this week and watched on as the Millers beat Derby in the Carling Cup on Tuesday night.
Paul Warne was on target for the second time in as many games against the Rams and summer signing Tom Pope will be hoping to keep his place.
Robins told the Sheffield Star: "I'm delighted we have got him (Le Fondre) because, looking at his record, he is a 20-goals-a-season man.
"We hope to work with him and that he'll gel in quickly but after the performance the other night, he might find it tough."
Meanwhile, the Millers' reward for beating Nigel Clough's side is an away tie at Championship promotion-hopefuls West Brom in the second round in the week commencing Monday August 24.