North Melbourne alerted the AFL of the change following training on Friday after Greenwood was unable to complete the session due to hamstring soreness.
Cruize Garlett has been called up for his first game of the season. The 21 year-old was not named in the emergencies yesterday but was the obvious replacement to fill the hole in the midfield with Greenwood's absence.
The Collingwood Football Club accepted the Roos' explanation on Friday and the emergency list will remain as originally selected.
A positive vibe could be felt around Arden Street on Friday morning as the Roos' trained for the last time before Saturday night's match.
Although it was only a short skills session, there were still several players looking to impress with doubts still lingering over the fitness of key forwards Aaron Edwards and David Hale.
Both looked to train freely, but emergencies Josh Smith and Nathan O'Keefe were key figures in a full ground drill and are waiting in the wings if either of the experienced pair pulls up sore.
 |  |
 |  |
 |  |
 |  |
 |  |
