He currently plays for Toronto FC, wearing the number 74 shirt. He plays primarily as a Midfield.

His most recent move was a from Toronto FC II to Cincinnati II on 2025-12-31.

Across 4 appearances in the United States Major League Soccer 2025, Michael Sullivan registered 0 goals and 0 assists, while completing 0 key passes out of 1 total passes with a passing accuracy of -.