The Galileo colt had previously finished third behind Harzand at Epsom and while he got closer at the Curragh, he was held off by half a length.
O’Brien has given him a break since that outing and expects him to progress for the outing in today’s trial for next month’s Ladbrokes St Leger at Doncaster.
“He’s in good form. He’s had a good break since the Irish Derby and is just ready to start again. He should improve plenty for the run,” said O’Brien.
The Ballydoyle maestro also runs Housesofparliament, who is the mount of Jamie Spencer and won the Bahrain Trophy at Newmarket last time out.
He had previously finished fourth behind the reopposing Across The Stars at Ascot.
“He’s a very solid horse and is in good shape,” said O’Brien. “He had a good run in Newmarket. He stays well and handles good ground.”
The Major General gives O’Brien a third string to his bow having been narrowly beaten by Ulysses in the Gordon Stakes at Goodwood.
Sir Michael Stoute’s Across The Stars cut no ice in the Derby but bounced back to win the King Edward VII Stakes at Royal Ascot.
Fair Eva is the star name among eight fillies declared for the Sky Bet Lowther Stakes at York tomorrow.
Roger Charlton’s youngster was hugely impressive on her racecourse debut at Haydock in June before providing the brilliant Frankel with his first Pattern-race success as a stallion with a breathtaking performance in last month’s Princess Margaret Stakes at Ascot.
Next year’s 1000 Guineas favourite faces another Frankel filly in the form of the Richard Fahey-trained Queen Kindly.