Juve fell 1-0 for the first-leg of their round 16 clash.
Goalkeeper Szczesny, however, insisted afterwards: "We got the first half completely wrong, without aggression or organisation. We sorted it out in the second, but it wasn't enough. This is nonetheless a result we can overturn in the second leg.
“We paid with a defeat today, but the second half bodes well and we have to push forward."
Matthijs de Ligt was off the field for treatment on a head wound when Lucas Tousart scored the goal.
“Being a man down clearly didn't help, but we should've prevented the ball getting to the by-line in the first place. Once they get into that position, there can be a ricochet or anything, it's before that we made the mistake."