Atalanta coach Gian Piero Gasperini blasted the "absolute confusion" of the refereeing performance in his side's Europa League quarter-final exit to RB Leipzig on Thursday.
La Dea had high hopes following their draw in the first leg, but a Christopher Nkunku brace handed Leipzig a 2-0 win instead, with the German side going through 3-1 on aggregate.
With Atlanta down 1-0 on Thursday, however, Antonio Mateu Lahoz waved away what appeared to be a handball from Leipzig's Dani Olmo and also waved away the consequent call for a VAR review.
Nkunku then punished Atalanta for a second time in transition, while Gasperini was left to bemoan the lack of consistency in refereeing interpretation and decision-making with the tie in the balance.
"The strange thing is that he [Mateu Lahoz] gave a punishment that for me was a less obvious foul than it was a penalty. There is absolute confusion on handballs," he said. "The referee himself, in 30 seconds, evaluates the first instance more serious than the second which is much clearer.
"Well, it's not like you can cancel it [from context]. We had a good match, we conceded something, as is normal in these matches. There are goal situations on both sides in Europe. Everyone has an important attacking quality. It wasn't the defence that penalised us."
According to the 64-year-old, the penalty reinforced Atalanta's need to chase the result, which played into the fast, dynamic and ultimately reactive RB Leipzig's hands.
"It is always like this," he said. "They have pace and speed, they play very tightly and then go on the counter-attack.
"Sometimes they do them very well, we attacked for a very long time and unfortunately in recent weeks we have had difficulty in finding the final pass, the decisive shot. Even if for long stretches it was an excellent match for Atalanta."
Champions League qualification is likely unattainable now for La Dea, who sit 12 points off fourth-placed Juventus in Serie A, but are also four points behind Lazio in the Conference League playoff spot. They face Hellas Verona on Monday.