"We were lucky to get through, said McEvoy, who won the Melbourne Cup for the third time".
O'Brien himself said: "Unfortunately these things can happen to a horse galloping around the field at home".
This is not the first time a racehorse has been euthanised following an injury sustained in the Melbourne Cup.
The Cliffsofmoher's jockey Ryan Moore looks dejected as he walks off the track, while Cross Counter's win in the Melbourne Cup plays on the big screen behind him.
Global horse racing giant Godolphin has finally won its first Melbourne Cup after more than a decade of trying, with Cross Counter winning the $7 million handicap at Flemington.
This Tuesday, it was Aidan O'Brien trainee The Cliffsofmoher who suffered a fractured shoulder during the running of the race and subsequently had to be euthanized.
The most catastrophic year for the race was 2014, when six-year-old Japanese thoroughbred Admire Rakti collapsed straight after the Melbourne Cup and died in its stall, while Araldo broke his leg on a fence after taking fright and was euthanased.
Moore was uninjured in the incident.
Described as a "tragedy" by veteran Seven commentator Bruce McAvaney, the United Kingdom raider pulled up lame as the field passed the finishing post for the first time.
The fines of the jockeys for excessive whip use would add to the anger of animal rights activists who were outraged by the euthanization of The Cliffsofmoher, which shattered a shoulder bone early in the race.
So too was Michael Walker on third placegetter A Prince of Arran, meaning all of the top three finishers breached the rules, along with three other riders in the race.
"This was an unfortunate incident that happens infrequently, with Victoria having one of the best safety records in world racing", a Racing Victoria statement read.
"It's very sad. It could have been worse, Ryan [Moore] could have taken a fall off him, someone could have been seriously injured".
In 2013, Verema had to be put down due to an injury in the Melbourne Cup.
"Today's tragedy is a stark reminder of the risks these horses face every time they run, and highlights that behind the gloss and glamour of Cup celebrations there is a dark reality".