The Infosys co-founder, who was brought back to head the firm in June last year, also expressed unhappiness over the laggard performance in the last two years.
"Under normal circumstances, our operating margin should have been 41.5 per cent. But it ended up as 23.5 per cent as of date and that means it is a drop of approximately 45 per cent.
"Therefore, revenue growth went down by 77 per cent and margin growth went down by 45 per cent during the period 31st March 2011 to 31st March 2013. These are matters of great concern for us," he told investors at a Barclays meet.
"About 48 per cent of our revenue gets translated to rupee and given that there was a devaluation of about 25 per cent in the Rupee-Dollar exchange rate, we should have added approximately 12 per cent to our operating margin," he said.
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He also pointed that the decline in operating margin from 29.5 per cent in FY'11 to 23.5 per cent for the current year is also a cause of concern.
"We are not very happy with our performance over the last two years in the financial year 2012, 2013. Our growth rate was about 5.8 per cent compared to the 11 per cent for the Indian software industry," Murthy said.
For the ongoing fiscal, which closes on March 31 this year, Infosys expects revenue growth to be somewhere between 11.5 per cent and 12 per cent.
Stressing that there is "absolutely nothing wrong" with its Infosys 3.0 strategy, Murthy accepted that the company could have "done a better job in executing that strategy".
He added that Infosys has set about an action plan to move towards better growth rate and better margins.
Infosys CEO and MD SD Shibulal said he expects sluggish growth in January-March quarter due to muted client spending, especially in retail and may spill over to 2014-15 fiscal.
Reacting to this, the firm's shares made a weak opening at the BSE and further plunged 9 per cent to Rs 3,340.