The Bianconeri failed to survive the group stages in 2013-14 as Real Madrid and Galatasaray proved to be too strong and have been picked against Atletico Madrid, Olympiakos and Malmo this time around.
Marotta has little doubt that the Turin club will do better this term but admits that there is a large gap between them and the elite clubs in Europe.
"We now have a proven group of players that, in recent years, was undone by a lack of experience. I think what happened last year will help us to not repeat the same mistakes again," he told the club's official website.
"Having said that, we must be aware of our club’s history and remember that qualification is certainly attainable. We're satisfied with the outcome of the draw.
"In the Champions League there is a considerable gap between ourselves and the big clubs.
"We hope to progress as far as possible in Europe and you can be sure that we'll give our all in every single match because we are well aware that this is a competition which can be decided by the smallest details."
Juventus kick off their European campaign with a home game against Malmo on Tuesday, September 16.