An Juan Jesus goal saw Spezia leave Naples with the 1-0 win.
Spalletti later said, "We lost a bad game, because we controlled it for long periods, but didn't do enough to finish our scoring opportunities.
“We didn't create enough spaces in the final third or make the moves that would split the Spezia defence. Then we got irritable in the second half and were lacking that final ball."
Spalletti hooked Dries Mertens at halftime.
“It was my choice, I wanted more weight upfront. Unfortunately, it didn't pay off. Now we have to go home and rest, there is a little fatigue and we are struggling now.
“Unfortunately, without Victor Osimhen we don't have as many options for attacking, so we need to always pass it around and unlock defences that way."
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