Mr Lewis was parachuted in from Unilever in September and said last month that detail on measures to strengthen Tesco's balance sheet and improve its competitiveness would be forthcoming on Jan 8.
However, he has repeatedly stated that investors should not expect him to lay out a major strategic blueprint for the next three years or put a figure on how many hundreds of millions of pounds he will invest in price cuts to narrow the gap with German discounters Aldi and Lidl in an attempt to stem its loss of market share in Britain.