The co-ownership deal with Udinese has been terminated, while a deal regarding Mauricio Isla has been renewed.
The Old Lady bought 50 percent of the midfielder's contract from their Serie A rival in the summer of 2012 in a deal also worth 9m euros and have now chosen to buyout the remaining half.
With the deal between clubs complete, the Ghanaian has signed a four-year deal which is set to keep him at the Juventus Stadium until June 30, 2017.
Asamoah, 24, has played 27 games for Juve and scored twice en route to the first Scudetto of his career.
Antonio Conte's side's negotiations with Udinese also involved renewing two co-ownerships deal which began last season: Mauricio Isla will spend 2013-14 in Turin while Cristian Pasquato will remain with the Zebrettes.