Juve lost the first-leg of their round of 16 tie 2-1.
"Entering the pitch without concentration is unacceptable, there was too much superficiality," Capello told Sky Italia after the match.
“Bentancur made a huge mistake in the first half and in the second half, eight defenders were not alert against three Porto players.
“This can't happen."
“Juventus lacked ideas, [Federico] Chiesa and [Dejan] Kulusevski came too deep to get the ball," Del Piero said.
“The player who does what Morata does was missing, and it became clear when he entered. We must underline that Porto played their game, as it immediately went well for them."
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