A day after club president Massimo Moratti set a date of November 15 for an official takeover by Indonesian businessman Erick Thohir, Inter closed the gap on leaders Roma to five points yesterday.
Roma, who have won nine games out of nine, face Udinese away Sunday when second-placed Napoli and Juventus, in third, face Torino and Genoa respectively in a bid to close their own five-point deficit on the leaders.
Inter, Italy's last winners of the Champions League, in 2010, have made a solid start to this campaign following a disastrous ninth-place finish last season.
Verona's second goal in the 71st minute from Romulo, however, underlined Inter's own lapses and Mazzarri told Sky Sport Italia: "We showed unnecessary naivety at times -- we can't ever afford to let our guard down in this league.
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"We played really well up to a certain point but if we want to be a side to be reckoned with, we can't afford to have these kind of slip-ups."
More dubious defending from the visitors allowed the Nerazzurri to double their lead only three minutes later.