It doesn't mean they're ready to play, it means they are back in training and running and everything else," said boss Dave Jones.
"It's probably seven to 10 days after that (before they are ready to play).
"In Ross's case, we need to look at why the hamstring keeps going, if there's a weakness there and if we need to work at that to make it stronger."
City face Sheff Weds this Saturday with Michael Chopra the main injury doubt after he was subbed at Ipswich last Saturday.