Unbeaten in his first 11 starts under rules, the Cheveley Park Stud-owned gelding met with defeat for the first time when falling as he sought a third win at the Cheltenham Festival in March.
Hopes were high he could bounce back to his brilliant best for a much-anticipated clash with Monkfish in Punchestown's Dooley Insurance Group Champion Novice Chase last month.
However, Henry de Bromhead's charge was struggling a long way from home before eventually being pulled up by Rachael Blackmore, while Monkfish failed to reel in his stablemate Colreevy.
Envoi Allen was found to be lame post-race, and a subsequent CT scan at Fethard Equine Hospital revealed he had chipped a joint.
"Surgery was performed successfully, and the vets seem very happy," said Cheveley Park's managing director Chris Richardson.
"He obviously suffered the injury when standing miles off one of those early fences at Punchestown.
"It took a while for the swelling to go down. But surgery has now been performed, and he can now have a nice holiday and hopefully come back later in the year."