Grand National-winning jockey Jamie Maguire has been ruled out of this year's race at Aintree with a back injury.

Maguire won the famous steeplechase on Ballabriggs in 2011, but is out for the rest of the jump season with a back injury.

"He's going to miss the rest of the season and start afresh on around May 1," PA quotes his agent Chris Broad as saying.

"He's been bugged with his back and is going to put it right so he doesn't have any hiccups."

This will be the second year in a row that Maguire has missed the Grand National.