Essendon excitement machine, Alwyn Davey, will miss tomorrow's ANZAC day clash with Collingwood after injuring himself during training this morning.

Team manager, David Calthorpe, said Davey will have scans on Monday.

""Alwyn won't play tomorrow after hurting his right knee in training,"" he said.

""It was an innocuous incident. He was simply doing a running drill and there was no player contact so we are at a loss to explain exactly why it happened.

Calthorpe said losing Davey is a blow because he is an important player and was excellent in last year's ANZAC day game.

No announcement has been made on who - out of emergencies Damien Peverill, Nathan Lovett-Murray or Darcy Daniher - will replace Davey in the side.