Of all the players the Cubs can and will look to extend, Javy Báez has long seemed like the priority due to both his popularity and potential for a reasonably club-friendly deal. Kyle Schwarber, Anthony Rizzo, and Willson Contreras will eventually need new pacts as well, and Kris Bryant indicated that recent developments might have made him even more amenable to an extension than he already was.
However, only Javy has been discussed publicly as being actively engaged with the organization on an extension. And not like a report about turning down what might seem to some like a huge salary.