Anderson was drafted 103rd overall in the 2017 NHL Entry Draft by the Los Angeles Kings. On April 23, 2019, he signed a three-year, entry-level contract with the Kings.[2] Anderson was called up to the Kings on February 28, 2020 and made his NHL debut the following day against the New Jersey Devils.[3] Anderson scored his first NHL goal on March 9, 2020, against the Colorado Avalanche in a 3–1 win.[4]
On September 10, 2022, Anderson signed a one-year $1 million contract with the Kings.
On February 15, 2023, Anderson signed an eight-year, $33 million extension with the Kings.
Personal life
Anderson's older brother Joey also plays in the NHL and the brothers skated against each other in Mikey's NHL debut.[5] His sister Sami and father Gerry both played hockey for the College of St. Scholastica, while his grandfather played for the Minnesota–Duluth Bulldogs.[6] His mother, Dana, was a professional racquetball player.[7]