"She will run for chancellor … She is absolutely determined, willing, and ready to contribute to strengthen the international liberal order. But we can't see the chancellor or Germany as last man standing," Roettgen told CNN in an interview.
The next German federal elections are set to be held between August 27 and October 22, 2017.
Merkel, first appointed as chancellor in November 2005, became the first female chancellor in the history of the country. Following the 2009 and 2013 federal elections, Merkel was reappointed as the chancellor.