The oil tycoon has watched both sides begin their seasons with disappointing results and thinks these are a sign that the two sides are no longer at that top-tier level on the continent.
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"Inter and Milan do not have super-teams any more," the 67-year-old said to reporters outside his office in Milan.
The Nerazzurri supremo went on to lend support for his young coach after their recent 2-0 loss to Siena.
"Yesterday's match was bad. We had to win against Siena, but failed.
"Stramaccioni is competent and we have a lot of good players. Unfortunately, we can no longer allow ourselves to spend €20m on a champion player," he explained.
Inter currently sit in seventh place in Serie A, six points behind Juventus at the top of the table. Milan are in 15th after amassing just three points to date.