Costacurta also criticized Theo Hernandez, claiming the defender is enduring the ‘worst’ season of his career.
Chukwueze was introduced with seven minutes remaining as Milan crashed out of the Champions League play-off round following a 1-1 draw against an injury-hit and relatively inexperienced Feyenoord side, resulting in a 2-1 aggregate defeat.
The seven-time Champions League winners had taken the lead in the opening minute through former Feyenoord striker Santiago Gimenez in the second leg.
However, maintaining their advantage proved challenging after Theo Hernandez was sent off early in the second half.
The French defender received his first yellow card for an unnecessarily aggressive shirt pull on Anis Hadj-Moussa in the first half, before picking up a second booking for simulation.
Costacurta believes Theo needs to do some serious self-reflection.
“I haven’t seen that many mistakes in a double knockout game for a long time,” Costacurta said while on punditry duty with Sky, reported via Corriere dello Sport.
“Certain blunders like those Theo made can’t happen at this level, it’s not acceptable. This year is perhaps the worst of his career and what he did tonight was the icing on the cake for Milan.”
He continued: “It’s not unreasonable to say that the blame for Milan’s elimination from the Champions League falls on Theo Hernandez. It’s not Conceicao’s fault, who, in my opinion, didn’t make a mistake in his team selection. The mistakes were made by the players, and they made serious ones in every game.”
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