"He's been fantastic for us, absolutely splendid," said O'Neill. "There are parts of his game he wants to improve on, but I tell you he is as brave as a lion. He's been as good as anyone in the Premier League this season.
"He made two great saves against West Ham to earn the team a point and two more against Wigan last weekend which were incredible saves.
"We would have gone two down if it wasn't for Simon's saves in the first half. He kept us in the game big time and maybe his work has gone a little unnoticed.