Inter manager Roberto Mancini has accused Jose Callejon of diving, which resulted in Nagatomo’s sending off.
Gonzalo Higuain gave Napoli the lead just after 63 seconds, after which Nagatomo was sent off for a second challenge after getting carded for an alleged attack on Callejon.
The second half saw Gonzalo get his and Inter pull one back, the late comeback was spurred and thwarted. With Mancini blaming the loss on Callejon.
“Personally I’m happy because we were always in it, even in the first half,” the Inter coach told reporters.
“Yuto was sent off for a little foul. We would never have lost 11 v 11 and we might even have won it because we played brilliantly. Sadly, that’s football for you.
[Jose] Callejon clearly dived for Nagatomo’s first booking, whereas for the second Yuto could have been a bit more careful.
“It was a very open game that was ruined by an unfair sending-off, so it’s hard to assess. [Napoli goalkeeper Pepe] Reina and Higuain were exceptional.
“As I said, that’s football but there’s no shame in losing if you’ve played well against the best team in the league and two of their players have had a night like that. On this occasion they got lucky and we didn’t.
“There was a ball we didn’t deal with properly at the start and Higuain did superbly to score an amazing goal.
“But we deserved more come the end of the match. I thought both Miranda’s and Jovetic’s headers were going in.”