The Centre may invite within a month the expression of interest (EOI) for strategic sale in three-to-four out of the 16 odd public sector units (PSUs) shortlisted, according to Neeraj Kumar Gupta, Secretary, Department of Investment & Public Asset Management. "As many as eight EOIs have been floated for strategic disinvestment of CPSEs and a few more would come out in the next four-six weeks," he told newspersons on the sidelines of an interactive session organized by the Merchants' Chamber of Commerce and Industry in Kolkata recently. National Projects Construction Corporation (NPCC), Hindustan Prefab, Central Electronics Ltd, Pawan Hans are among the eight odd companies for which EOI has already been floated. "There is potential in these companies, we need to unlock them," he said, explaining the rationale behind the strategic sale. The government has given in-principle approval for strategic disinvestment in Air India and the matter is being processed meticulously, he said.