Del Neri urges caution in Europe but is pleased with his side's rate of progress...
The Bianconeri were paired against Graz in Friday's draw in Nyon, with the first leg taking place on August 19 away from home.
And Del Neri has adopted a cautious approach as he prepares his side for new beginnings on the continent.
"We have to close with the past and we are growing as a united team, and there is plenty of competition among the players," he told Sky Sport Italia.
"However, we must not underestimate Sturm Graz and I will not make wholesale changes for the next game."
Juventus are reportedly close to signing Milos Krasic from CSKA Moscow. Del Neri offered his view, but remained tight-lipped over a potential deal.
"Krasic? We will see how the market ends. We have good wingers, but things are complicated. Whenever we hear about Juventus everything seems to rise," he said.
"We have to be careful, but improve the team. It's not easy as we already have high quality."