On their plastic pitch, the Norwegians stunned Inter 3-1 in the first-leg of their Champions League playoff last night.
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And Costacurta told Sky Italia: "I don't want to defend Inter, but this isn't football, it's another sport. Manchester City and Atletico Madrid also lost...
"I wouldn't think too much about it... They've been three strange games for a number of reasons, even though we've been saying for a while that there are stronger teams, with a different pace.
"As for tonight, I still say the pitch is too different. Juventus also won there, but at that point they were at the end of their season."