City's hopes of getting James Meredith back before the end of this season have taken a further blow after the club were told that the defender will need complete rest for at least a whole month.
The Australian left back was eventually diagnosed with suffering from glandular fever at the back end of last week after being taken off ill during the half time interval of City's New Year's Day encounter at Morecambe.
Meredith is now back home after spending last weekend in hospital, and Parkinson believes City will know more about how long the defender will be sidelined for once his one-month period of rest is over.
Parkinson said: "We've been told he's going to need to have complete rest for a month."
"Until that month is up, we won't have anymore idea as to how long exactly he will be out for.
"It's all a blow to us, and it's a blow to James himself. He's had a great season up to now, but these things do happen unfortunately.
"We will try and give James the best medical advice and help we can do.
"A lot of it for James now, however, is simply staying at home and resting up."