Watch video analysis of Masar's win in the Investec Derby from James Willoughby and Nick Lightfoot from The Verdict.
Masar will skip a rematch with Saxon Warrior in the Irish Derby and will be pointed towards the Coral Eclipse at Sandown on July 7.
The three-year-old son of Derby winner New Approach scooped the Derby under William Buick this month, and has previous form at the Esher course, having won the Solario Stakes from subsequent Irish 2,000 Guineas winner Romanised last season.
Masar underwent a routine gallop at Charlie Appleby’s Moulton Paddocks facility in Newmarket on Wednesday, after which the trainer told the Godolphin website: "His Highness Sheikh Mohammed and I discussed Masar’s program at length and have reached the conclusion that the Eclipse will suit him best.”
"We will leave him in the Irish Derby, just to keep all options open. But the intention is to run in the Eclipse.
"Masar has won at Sandown (the G3 Solario Stakes), showing that he acts well on the track and dropping back in trip will be no problem — he won the Group Three Craven Stakes and finished third in theGuineas. He’s got plenty of speed."
Roaring Lion, who displayed a searing turn of foot in the final three furlongs when successful in the Dante Stakes at York last month before finishing third to Masar and Dee Ex Bee in the Derby, is the 3-1 second favourite.
As a result, Saxon Warrior hardened for the Irish Derby, and is now only 8-13 to hand Aidan O'Brien a 13th victory in the June 30 contest.