Speaking to LBC 97.3 radio presenter, Nick Ferrari, Mr Johnson said trade was "patchy", but claimed the Games were "overwhelmingly for the benefit of the city". He added:
If you look at the spend by tourists in the city, it was up overall. The economic impact of the Games is estimated to be massively positive.
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In a wide-ranging Peston on Sunday interview, he said Parliament security needs reviewing and the PM's counter-terror strategy is flawed.
The terror attack carried out by Khalid Masood at Westminster that left four people dead lasted less than two minutes say police.
Two knives were found at the scene in Islington, North London, and the suspects fled on foot before being arrested.