Iafallo had a big season for the University of Minnesota Duluth as a senior in 2016-17 with 51 points (21 goals, 30 assists) in 42 games. He had 121 points in 152 games in four seasons at UMD before signing a two-year contract with the Los Angeles Kings as an undrafted free agent on April 19, 2017.
"There's a lot of great organizations out there," Iafallo told NHL.com on Jan. 10, 2018. "This one was the best for me. They're really pushing on development. I'm a development kind of guy. I felt like everything was in a good spot."