The stand-in boss reflected on the standard of the Bianconeri's opponents, while goal hero Leonardo Bonucci was buoyed by Tuesday night's draw
A goal by Leonardo Bonucci levelled affairs on the night after the Ukrainian visitors had taken the lead via Alex Teixeira. The result means that the Bianconeri have now drawn their first two Group E fixtures.
"We went out onto the field a little timid and tense," lamented Carrera to reporters after the match. "We conceded a goal, but did well to get straight back."
"Last season we did not play in Europe, so maybe this is why we are so tired. We are not used to playing so many games and we have not been able to let some important players rest so far.
"Teams in the Champions League are strong, but we will fight against everyone. We have some really strong teams in our group, but I am sure that Juventus will be competitive until the end."
Despite the disappointing draw, in which Shakhtar had several opportunities to win the encounter, Bonucci is refusing to dampen his hopes for European progression, however.
"We went on to the pitch a little too timid," the 25-year-old expressed to Sky Sport Italia. "However, considering how the game was going, we did well to get back in it."
"When we attacked Shakhtar, we put them under a lot of pressure. Juventus must always seek to take the game to the opponents."
Opposing coach Mircea Lucescu lent an insight to how he halted the home side's forays: "We had the advantage in terms of possession, and we made Juventus run a lot.
"We made Juventus run a lot, and had more chances to score than they did. I am very glad about the way we played."