COLLINGWOOD defender Harry O'Brien has put his hand through a pane of glass and will miss the club's NAB Cup opener.
 
The 25-year-old required stitches and didn't train at Gosch's Paddock on Wednesday.

Coach Nathan Buckley described the weekend mishap as a "freak accident."
 
"We can't take a trick at the moment," Buckley said.
 
"It's just an opportunity for young blokes to come up and take more responsibility in those roles."
 
O'Brien played 24 games in 2011 and is again expected to play a crucial role in defence.
 
The Magpies squad for the pre-season mini-matches, with the Swans and the Bulldogs at Blacktown on Saturday night, will be named on Thursday.

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