Sadly, a setback has ruled him out of this legendary race. He was booked to fly out to the States this weekend but had a high temperature at routine inspection.
The owners tweeted: "We very much regret that #Gronkowski will miss the @KentuckyDerby after spiking a fever over the weekend and being treated with antibiotics. He can't make the long journey to Louisville but is doing well."
Gronkowski, named after National Football League legend Rob Gronkowski, was unbeaten in four races on the all-weather. He was given the opportunity to go to the Kentucky Derby after winning the Listed Burradon Stakes at Newcastle.