Former West Brom centre-back Barnett injured his hamstring in last weekend`s win over Reading and has been ruled out for the rest of the season.
Manager Paul Lambert is hoping to add a loan signing to his squad as cover but not in time to face Leeds, so Zak Whitbread will start at Elland Road.
Midfielder Andrew Surman made his return from a long-standing knee injury as a substitute last time out and is an option to start.
The Canaries could go second in the table with a win but have not won at Elland Road since August 1993 - when a brace from Ruel Fox set them on the way to a 4-0 win.
Source: PA
Source: PA