"Football has been a huge part of my life for as long as I can remember. Sometimes you take for granted how much you value something until it's gone. My goal is to make it back to the NFL and I realize I have to earn that privilege," Manziel said in a statement released by the developmental league. "The Spring League has provided me with a great opportunity to play ball again, and ultimately, that is all I want to do. I miss the competition."