"There was uncertainty, because people were unsure how the process [PPP administration] would affect them. Some chose to leave, but the vast majority decided to stay," he said.
Sockett told NCE that staff numbers were 10% down, and the business, now out of PPP administration and a subsidiary of Transport for London, is keen to recruit as it ramps-up its civils programme.
TfL has confirmed that it will not be re-branding the contractor, but the company's long-term position role TfL is so far undecided.
Sources within TfL have told NCE that it is waiting to see how it adapts to swallowing the contractor before making longer term decisions. Staff positions would be secure, however.
Since transferring to TfL, Metronet's 6,000 staff now benefit from its generous final salary pension scheme, two Oyster cards per household and up to 75% reimbursement on Network Rail season tickets. Sockett hopes these perks will help attract talent to Metronet.
Metronet holds PPP contracts to upgrade two-thirds of the London Underground network over the coming 25 years.
Sockett said that the need for staff would increase in the coming 18 months as 100 staff on secondment from consultants Atkins would be returning there.
Metronet was formed in 2003 to upgrade two-thirds of the London Underground network. Its shareholders were Atkins, Balfour Beatty, EDF energy, Thames Water and Bombardier.
Staff from the shareholder companies operated the company's contracting arm, Trans4m, on secondment.
Trans4m was wound-up as Metronet entered PPP administration in July last year.