Shanahan said that he has already proved himself capable in the NFL and added that he learned a lot in his previous role working with his father.
"I'm looking forward to it," Shanahan told the Washington Post. "I think it's gonna be nice when I hear the head coach's last name and 'S' isn't always tagged to the end of it - the Shanahans.
"So I'm looking forward to that part. But I've worked a lot of years in the NFL. I started out my career away from my dad. That was always a goal of mine, to prove myself before I ever coached with my dad.
"I thought that I had proved myself. It was something I always wanted to do in my life - I wanted to coach with my dad at one time. I'm excited to move on and be done with that part of my life, but I think it made me better, and it's something that I'm glad that I did."
Shanahan was at the Redskins for three years.