Andrea Stramaccioni has branded Inter's defeat to Juventus in Saturday's breathless Derby d'Italia match as sinful.
An early goal from Fabio Quagliarella gave Antonio Conte's men the lead before Alessandro Matri ensured that Rodrigo Palacio's equaliser was nullified to secure a 2-1 win for the visitors.
The young coach cited Inter's profligacy and the effect of Quagliarella's early strike as the main causes of their defeat.
"Quagliarella's early goal cut us down," Stramaccioni told a press conference following the match. "We had a few chances through Palacio and [Antonio] Cassano in the first half but failed to score."
"It is undeniable that our intensity rose in the second half, though. We forced Juve to retreat but their second goal came during our best spell. It was a sin."
Stramaccioni maintained that his side must remain motivated and recognised that the game was an entertaining spectacle but expressed his disappointment at the result.
He continued: "We must not change our objectives [for the rest of the season]. We are pleased with our performance. It was a good match and in the second half we played very well against the best team in Italy.
"There is still a sour taste in my mouth because we came within touching distance of a point. We did not deserve to lose, but you have to respect the result on the pitch."
Stramaccioni highlighted one positive aspect in particular for Inter - the bright performance and future of January signing Mateo Kovacic.
"Kovacic is the future of Inter's midfield," he added. "He is growing and I have great confidence in his ability."