The switch to wing backs coincided with Rovers' upturn in fortunes under their new boss, but Ferguson switched to a flat back four and midfield diamond against Walsall on Tuesday night in a bid to arrest a recent slump in form.
However, ahead of this weekend's M180 derby at Scunthorpe, Ferguson said the 3-5-2 remains an option.
"I've not ditched it. I would never do that," he said.
"I wanted to go with a very quick back four against Walsall. We wanted to play high up the pitch against them to try and stop the space for [Romaine] Sawyers and I thought we did that well.
"So no I've not ditched the three.
"Sometimes you're going to make changes and I thought the diamond was the right shape to play against them and it caused them problems but we'll keep working so the players know different formations.
"I thought the three at the back needed changing because I think teams have seen us playing it for a long time now and it can become easier to work out.
"I've said before I think it's important for us to be flexible with formations."
Andy Butler is set to return to the startling line-up at Glanford Park tomorrow after recovering from a groin problem.