So Mi Dar has endured a frustrating season to date and has yet to be seen in racecourse action, with Gosdon choosing to skip an engagement at York due to soft ground and then suffering at setback.
Shutter Speed has a verdict over Gosden's dual Oaks heroine Enable to her credit earlier in the season, but she was only fourth in the French Oaks, albeit not beaten far.
"Both of them are on target for the Nassau," said Gosden.
"I was very pleased with So Mi Dar's work at the weekend, she's coming along nicely for it.
"Likewise Shutter Speed, I think she would want to see the ground dry up, she doesn't relish soft, she handled it in the Musidora but it's not her thing."
Gosden's Royal Ascot winner Stradivarius will aim to follow up his Group Two win in the Queen's Vase against his elders, but smart filly Dabyah will stay at home.
"Stradivarius is likely to run in the Goodwood Cup," Gosden said.
"Dabyah won't be going a mile again, she was the last one off the bridle in the Coronation, but she's a seven-furlong filly and we'll keep our powder dry for the better races over seven.
"I'd doubt she'd run in the Lennox, we'll keep our powder dry a little longer."