"I'm just out here to compete," Robertson said. "I don't really got nothing to prove. I just like to compete."
Competition aside, Robertson recruitment is narrowing down to his June 7 decision.
"Two months ago I talked with [U-M defensive coordinator] D.J. Durkin," Robertson said. "We talked about the defensive scheme and how I fit in. He really wants me to get down there. I'm just waiting for the opportunity to get down there."
Robertson took a visit to Nebraska on Sunday, and plans on taking another visit to MSU on April 18. And says he would like to visit U-M soon, but needs to make room in his busy schedule.
"Every weekend is pretty full," Robertson said. "I'm going to try to get there."
Later adding: "It's a possibility. But I'm not going to make no promises. Most likely I will be able to go up there."
With Michigan State and Norte Dame being his frontrunners, what would Michigan need to do to get back in the race?
"I just want to see how things are ran down there," Robertson said. "How the coaching is. Talk to a couple of their players and see how they like it. How they like the new coaching staff."
If he visits, of course, he wants to meet Michigan coach Jim Harbaugh for the first time.
I want to know more about him," Robertson said of Harbaugh. "And I want him to know a little bit more about me. I want a relationship more off the field. You know what I mean? Instead of a coach-player relationship."