The next step allows for contact training.
Players will be split into groups of up to 10 with each group designated an individual pitch and individual staff members.
Since a week last Monday, players were only allowed to train on a non-contact and unopposed drills basis, in groups of no more than five.
Now this development means Pep Clotet and his staff can begin to gear things up more in readiness for the Championship return on 20 June.
Players will still have to adhere to social distancing where possible and there is no relaxing of any of the health and safety regulations put in place at the Trillion Trophy Training Centre, Wast Hills.
The squad will still have to arrive in their own kit and with their own drinks and equipment and leave immediately after training has finished.
Players and staff are being tested for COVID-19 twice weekly.
Blues will be allowed to move into full team training in due course under the guidance of the coaching, medical and performance staff and in accordance with RTT.
All training practices and drills are assessed in advance utilising the EFL's Risk Assessment Framework and can be modified as appropriate in order to reduce the risk for all players involved.
Both Clotet and the Club's Head of Physical Performance Sean Rush told BluesTV last week that they have been delighted with the players professionalism, attitude and hard work since football was suspended on 13 March and lockdown introduced.
They adhered to individual training programmes in the weeks before Wast Hills could be re-opened and have shown a determination and desire to be in the best shape possible when the action resumes.