The Blades are in search for a new goalkeeper to back up first choice Paddy Kenny in case of injury or suspension despite already having former Blackpool keeper Phil Barnes on their books.
The Mirror, who published the story today believes that the 32 year old would agree to a move away from Upton Park.
Since his move from the Bescot Stadium in August 2004 Walker has played just twenty times. He had already played 232 games for the Midlands club before his move