Millington began his career with Georgetown FC, where he spent two seasons. In 2005, he joined Western Tigers, but in his fifth season with the club saw them relegated to the second tier. He then joined Alpha United in 2010, and in four seasons stormed to success in the Guyana Super League on four separate occasions. Millington moved to Slingerz FC in 2015.[1]
Millington made his international debut for Guyana on 8 August 2008, playing in a 3–0 win over Dominica in the 2008 Caribbean Championships. He made a further two appearances in the competition, but failed to make the scoresheet.[2]
He scored his first international goal on 28 October 2009, scoring the only goal in a 1–0 win against Suriname in the Suriname Independence Cup. His second goal came just two days later, scoring in a 1–0 victory over Netherlands Antilles in the same competition. Millington scored twice during the 2010 Caribbean Cup, against Suriname and Saint Vincent and the Grenadines.[2]
- Scores and results list Guyana's goal tally first.[3]
| No | Date | Venue | Opponent | Score | Result | Competition |
|---|
| 1. | 28 October 2009 | André Kamperveen Stadion, Paramaribo, Suriname |  Suriname | 1–0 | 1–0 | Suriname Independence Cup |
| 2. | 30 October 2009 | André Kamperveen Stadion, Paramaribo, Suriname |  Netherlands Antilles | 1–0 | 1–0 | Suriname Independence Cup |
| 3. | 17 October 2010 | André Kamperveen Stadion, Paramaribo, Suriname | Suriname | 2–0 | 2–0 | 2010 Caribbean Cup qualification |
| 4. | 6 November 2010 | Manny Ramjohn Stadium, Marabella, Trinidad and Tobago |  Saint Vincent and the Grenadines | 1–0 | 2–0 | 2010 Caribbean Cup qualification |
| 5. | 4 June 2016 | Addelita Cancryn Junior High School Ground, Charlotte Amalie, U.S. Virgin Islands |  U.S. Virgin Islands | 3–0 | 7–0 | 2017 Caribbean Cup qualification |
