Marchisio, capped 55 times by Italy, progressed through Juve's youth ranks and only played for one other club, spending a year on loan at Empoli in the 2007-08 season.
"Having had the opportunity to accompany him on this path, to discover a homegrown champion, day by day, was quite simply a privilege and an honour," Juve said in a statement.
Marchisio made a total of 389 appearances in all competitions, scoring 37 goals, and won seven Serie A titles as well as four Italian cups with the club.
"I love this shirt (Juventus) to the point that, after all, I am convinced that the good for the club comes first," the player said on his Instagram account.
Marchisio suffered a series of setbacks following a cruciate ligament injury in his left knee in 2016 which initially left him out of action for six months.
(Reporting by Silvia Recchimuzzi in Gdynia; Editing by Christian Radnedge)
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