Terry is back in light training, and worked on Friday without a ball, but his recovery from knee surgery is proving complicated according to Benitez.
He was initially hopeful that his captain would return for Sunday's Premier League clash with Aston Villa, but those hopes are now out of the window and Benitez said Terry would need to come through harder training with no after-effects to come close to consideration.
"The knee is quite complicated," he said. "At least he's now on the pitch - that is positive news - but we cannot say, we cannot predict how long it will take.
"It's one step forward, one step back."
Further asked if Terry would make his comeback in the next fortnight, Benitez said: "I hope so but I am not a doctor. So I cannot guarantee anything."