Before making the switch, the Croatian international received advice from Juve defender Benedikt Howedes, who joined the Italian side after spending his entire senior career with Schalke.
"I spoke to Benedikt Howedes about Schalke a lot, and he had so many positive things to say about the club and the fans here," he said.
The decision to loan Pjaca out comes after Juve manager Massimiliano Allegri acknowledged he was unable to give the 20-year-old enough opportunities to play.
"Pjaca is not getting much of a game so he is going to leave on loan so that he will come back to us stronger than before," he said earlier this week, according to Ben Gladwell of ESPN FC.
Since his transfer from Dynamo Zagreb in summer 2016, Pjaca has been limited to just 20 appearances, largely due to a serious knee injury he suffered in March 2016 that sidelined him for six months.