He joins prop Ronan Loughney, Brian Tuohy, Eoin Griffin as well as Rodney Ah You, Dave Gannon, Mark McCrea, Dave Nolan, Andrew Browne and James Loxton on the sidelines and Elwood admits that ahead of Saturday's trip to Aironi, the cupboards are looking bare.
"We are under a bit of pressure - the last couple of derby matches have exerted their toll. Those injuries to key personnel are quite serious for us, in addition to our long terms injuries," he told the Galway Advertiser.
"It is one thing surviving the game, but Johnny didn't survive the game, he put himself through the mill for the 80 minutes and played like Johnny O'Connor always does.
"That is a testament to him and his commitment to the cause - brave man is an understatement.
"It does leave us a little bit thin, but we have the younger lads to call in if need be."