|Date of birth||31 January 1988|
|Place of birth||Amsterdam, Netherlands|
|Height||1.78 m (5 ft 10 in)|
|2009||→ RBC Roosendaal (loan)||15||(0)|
|* Senior club appearances and goals counted for the domestic league only and correct as of 16 January 2017.
He spent the 2009-10 season on loan at RBC Roosendaal. The loan contract had an option to purchase the player, an option which RBC took advantage of on 11 June 2009. Nelson was released by RBC on 11 January 2010.
After six months without a club, he signed for CSKA Sofia in June 2010. In January 2012, he signed for Ukrainian club Metalurh Donetsk on a three-and-a-half year contract. On 11 March 2012, Nelson made his official debut for the team from Donetsk, playing the first 74 minutes of the 1:1 home draw with Metalist Kharkiv in a Ukrainian Premier League match.
On 6 March 2016, Nelson scored a controversial goal during the 1-1 away draw with Beroe Stara Zagora. He was chosen for man of the match. In an interview immediately after the game, he admitted that the ball hit his hand before he scored the goal.
- AZ-talent Gregory Nelson beste B-junior van - AZ Fanpage
- Toet, Van Driel en Nelson langer bij RBC R'daal
- Zimmerman en Nelson verlaten RBC Roosendaa
- "ЦСКА се подсили с играч на АЗ Алкмаар" (in Bulgarian). Gong.bg. 11 June 2010. Retrieved 11 Jun 2010.
- "Димитър Борисов: Зику и Нелсън са продадени, ЦСКА ще свива бюджета". Dnevnik.bg. 30 December 2011.
- Пресс-служба ФК «Металлург» (Донецк) (11 January 2012). Грегори Нельсон – первый новобранец "Металлурга" (in Russian). Metalurh Donetsk official website. Retrieved 12 January 2012.
- n/a (11 March 2012). "FC Metalurh Donetsk vs. FC Metalist Kharkiv Match Report". soccerway.com. Retrieved 16 March 2012.
- Ботев привлече Грегъри Нелсън
- Ботев с труден и ценен успех над Пирин, Нелсън дебютира с победен гол
- Ботев отстъпи пред Литекс в зрелищен двубой в Ловеч
- Грегъри Нелсън: Паднахме заради качествата на Литекс
- Честният Нелсън: Играх с ръка
- "Кайсар подписал воспитанника АЗ Алкмаар.". fckaysar.kz (in Russian). FC Kaisar. 16 January 2017. Retrieved 16 January 2017.
- "Нельсон вместо Кайсара будет играть в Бахрейне". sports.kz (in Russian). Sports KZ. 21 February 2017. Retrieved 22 February 2017.
- "AFC Cup 2017 Roundup: Johor Darul Ta'zim off to a good start, Al Muharraq stunned by Saham". goal.com. Goal.com. 21 February 2017. Retrieved 22 February 2017.