Some would argue he deserved one, though.
However, he did says his goal was to "compete" before the competition began, and was easily one of the top-ten players in attendance.
Even with no invite made, Robertson's recruitment is still very much in play.
In fact, Robertson says his top three teams are Michigan State, Ohio State and Notre Dame. Adding that he has possible upcoming trips to Michigan, Notre dame and Alabama. He even went far to say, he might be visiting Michigan today with fellow Hoosier stat star -- Austin Mack.
"I just want to go down there and see how much Coach Harbaugh has changed the program around," he said of Michigan. "How much he's improved it there. And just talk to the coaches. Just starting to build a relationship if I do go down.
"And if I do go down, talk to the players and see what they think about the coaching situation and how they feel about Coach Harbaugh."
Is it fair to say his relationship with Michigan is getting better?
"It's improving," he admits. "Before Coach Harbaough, I didn't talk to Michigan for a month or so. I just started talking to them more like a month ago."
And now, Robertson says he talks with Michigan and Harbaugh on a regular basis. "He's a pretty good coach and talk to him often," he said of Harbaugh. "I've been also talking to Coach Harbaugh on Twitter too. I talk to him like twice a week."
With his decision coming up June 7, Michigan still has some catching up do.
And Monday's potential visit could help them catch up in the race.