Godolphin trainer Charlie Appleby will wait until next week before making any plans for Masar after a late setback forced him to miss the Coral-Eclipse.
The Investec Derby hero was set to try to supplement his Epsom victory in Sandown’s 10-furlong feature, but was found to be sore following exercise on Friday and was declared a non-runner.
Speaking before racing at Sandown on Saturday, Appleby said he expects to have a better idea of how long his stable star could be out of action for in the middle of the week.
Appleby said: “He is under veterinary care now. The inflammation is coming down and we will be able to get a better diagnosis of what we are dealing with over the next few days.
“All being well, by the middle of next week we should know what we are dealing with and we can then put a timescale on everything.
“Yesterday the soreness and inflammation was there and once we made the decision he was not running, we got the anti-inflammatories in there to get the swelling down.”
He added: “At the end of the day, coming here today was the race everyone was looking forward to. You’ve the Derby form here again and it is the first time the three-year-olds are taking on the older horses.
“I’m very fortunate in who I work for (Sheikh Mohammed). You’ve got to be positive in this game and keep pushing forward.
“Until the middle of next week, I would be giving everyone false impressions if we said the King George or Arc. Until we get next week out the way and know what we are dealing with, I can then give people a race plan.
“The most important thing is the inflammation is coming down.”
Godolphin‘s Masar can join an elite band of horses to complete the Derby-Eclipse double when he lines up for the Coral-sponsored Group One at Sandown.
The feat has only be achieved five times since the end of the Second World War, with Tulyar in (1952), Mill Reef (1971), Nashwan (1989), Sea The Stars (2009) and Golden Horn (2015) standing tall in the annals of racing history.
Now it is Masar’s turn to join that illustrious honour when he takes on older horses in what is the first major clash of the generations in a season.
Masar heads to the Esher track with top-class credentials. Winner of the Solario Stakes there in September, the son of New Approach has ventured far and wide with trips to France, America and Dubai.
While he was not successful in any of those countries, the experience stood him in good stead and were crucial to his education.
His first victory of 2018 was a sight to behold at Newmarket where he blitzed his Craven Stakes rivals to scorch home by nine lengths.
His 2000 Guineas effort was creditable, though he had to settle for third place behind Saxon Warrior, but he reversed that form in some style at Epsom with a commanding performance.
Strangely, he has yet to run over a mile and a quarter but the evidence is it should suit him, as will the fast ground.
Masar delighted trainer Charlie Appleby in a workout at Newmarket at the weekend and Godolphin can celebrate another important triumph in a brilliant year for the team.
The day can start in the right vein for Godolphin with Sound And Silence in the Coral Charge.
The three-year-old sprinter has been burdened with a penalty for a Group Three success at Maisons-Laffitte in September but that has now gone.
Now he is back competing on equal terms, the son of Exceed And Excel can return to winning ways.
Godolphin‘s Twilight Payment finished third in the 14-furlong G2 Curragh Cup at the Curragh on Sunday, despite not being suited by the fast ground.
The sire of Teofilo, trained by Jim Bolger and ridden by Kevin Manning, raced in third of the seven runners on the inside and after a half-mile was fourth.
The five-year-old wandered around when trying to make a challenge in the straight and was one-paced in the final furlong, going down by four and three quarter lengths to the winner Flag Of Honour whose time was 3m 2.46s on going described as good to firm.
Jimmy Hyland of Godolphin said: “Twilight Payment has run well again, but he did not enjoy the fast ground.
“He wandered around and became unbalanced on it. He wants slower ground.”