Threading, who bolted up in a Listed contest at York last month, is set to step back up in class for the Coronation Stakes at Royal Ascot next week.
Trainer Mark Johnston has assembled his usual strong squad for the summer shopwiece and son and assistant Charlie can't wait to unleash them.
He said: "The Coronation is probably shaping up to be the race of the meeting now the English, Irish and French 1000 Guineas winners could all be going there. It's going to be a very tough race, but we saw in the Lowther last year, Threading is a very high-class filly. It is hard to say what level her performance was at York last time, but the manner in which she beat them was of a top-class filly, so I think Ascot is the place to go."
The form of Mildenberger's runner-up finish in the Dante at York has worked out well, with his conqueror Roaring Lion finishing third in the Investec Derby.
"We are very happy with him. He is in the King Edward VII and Queen's Vase at Royal Ascot," said Johnston. "The initial plan before Epsom was that Mildenberger would probably go the King Edward and Dee Ex Bee would go for the Queen's Vase. That was on the assumption that Dee Ex Bee would finish fifth or sixth in the Derby, but he finished second.
"He has run himself out the Queen's Vase. The likelihood is Dee Ex Bee sidesteps Royal Ascot altogether, in which case you could pick either race as Mildenberger's target. I would probably say he is 65-35 going for the King Edward VII over the Queen's Vase."