Cheltenham Gold Cup favourite Thistlecrack has been ruled out for the rest of the season with a slight tendon tear.
The nine-year-old won his first four starts over fences, including a three-length victory over Cue Card in the King George VI Chase on Boxing Day.
"The vet scanned him this morning and it's a slight tendon tear," said trainer Colin Tizzard.
"We've seen it at every yard and it happens every year."
More to follow.