Moore told BBC Radio Sheffield that the clubs move for a striker to replace Drewe Broughton was thwarted at the final stages yesterday.
Ronnie explained: "We thought we'd got our man when Drewe went to Lincoln but that's now dead in the water.
"We're looking to bring someone in, no doubts about that. I want someone with pace and something a bit different to Drewe to add to my options."
It's thought Broughton could return to the Millers after his original month loan at Sincil Bank expires, but the option is there to extend the deal for both parties.
Meanwhile Dale Tonge will miss tomorrow's game with Torquay with injury and is also ruled out of Monday's live Sky game with Shrewsbury Town.