The Australian goalkeeper was sent off against Leeds United in The Owls' last game and was set to be suspended for the trip to Roots Hall.
But Wednesday appealed the decision and fortunately for the club, a verdict of wrongful dismissal was reached.
So now the on-loan Middlesbrough star will be between the sticks for the clash in Essex.
In other news, Marcus Tudgay is set to play in the reserve's game with Walsall tonight - it will be the striker's first appearance of the season after returning from a foot injury.