Walsh, battling an ongoing back ailment, appears on track with his rehabilitation, as he returned to skills training and is expected to venture back into full training in the coming weeks.
The prolific 22-year-old's timeline for return is said to be unchanged, with a further update to come closer to Round 4.
Durdin, meanwhile, won't be fit for the Blues' tone-setting bout with Richmond on Thursday night, with the club's update stating the small forward will be available for selection from next week.
Updates on seven Blues leading into tomorrow night's season opener.
— Carlton FC (@CarltonFC) March 14, 2023
Rebounding defender Jordan Boyd (foot) and wingman Matthew Cottrell (foot) have only ventured so far as respective running programs, while, in a positive turn, half-forward Lachie Fogarty has returned to full training after recovering from a back complaint.
David Cuningham is continuing in his recovery from a pre-season shoulder dislocation, however, a more definitive update will be provided within the next month, while key defender Caleb Marchbank is only scraping the surface of his rehabilitation from a longer-term calf issue.
The Blues will go into battle against the Tigers on Thursday, March 16 (7:20 PM AEDT).