Rangers boss Philippe Clement recently said that preparing for the Celtic clash and Thursday's 1-1 draw against Tottenham in the Europa League had been difficult because the opposition were "financially out of our league".
Celtic's most recent financial accounts showed they had £77 million in the bank and made a pre-tax profit of £17.8 million last season. Over the same period, Rangers made a net loss of £17.2 million and started implementing cuts to their first-team squad.
Clement's comments did not go down well with many Rangers fans, who believe their team should still do a better job of challenging Celtic's dominant spell as 12-time Scottish champions in the last 13 years.
Rodgers responded by making the point that Celtic's financial performance has been built from a successful strategy based on developing players for profit.