The German international has featured 53 times in all competitions, scoring 11 goals, since joining the Magpies from VfB Stuttgart last summer.
Nick appeared as a second-half substitute during Saturday’s 2-0 Premier League victory away to Tottenham Hotspur.
The 24-year-old will now link up with Luciano Spalletti’s Juventus, who sit fourth in the Italian top-flight after winning both of their opening fixtures.
Everybody at Newcastle United wishes Nick the very best of luck for the season ahead.




