O'Brien is currently on an extended loan to the Owls from Bolton and Allardyce is pleased to see the Irishman flourish during his time at Hillsbrough.
"I wouldn't want Joey away for more than a month if he was at a club that wasn't doing well,"
"When Peter Eustace (Owls chief scout] came to see him, he identified him immediately as someone who could play in Wednesday's first team. He has been proved correct" Allardyce told the Sheffield Star