United brought in Nick Powell, Alexander Buttner and Chilean striker Angelo Henriquez, who all look set to make their debuts in the eye-catching Carling Cup tie with Newcastle at Old Trafford on September 26.
"I think that will be the route," Ferguson told Inside United.
"(Henriquez) is strong with great shoulders on him for a boy of 18.
"He's coming into training with the first team, like Nick Powell. Nick's doing very well. He's a very good player and maybe Buttner depending on how he has progressed with the first team."