Magical will have to pass a late fitness test before being given the green light to run in the Investec Oaks after suffering a setback.
Aidan O’Brien’s filly is the general second favourite for the Epsom Classic on Friday, behind the Charlie Appleby-trained Wild Illusion, but her participation could now be in doubt.
O’Brien told Press Association Sport: “She just gave herself a little bit of a tip on the inside of her joint this morning.
“There was a little bit of filling in it this morning but it scanned perfect and we’re going to make a decision about her in the morning.
“The filling has to be gone out of it in the morning and we’re cooling it at the moment.
“Hopefully it will be gone and if it is there won’t be a problem.”
Magical, who won the Group Two Debutante Stakes as a two-year-old, has run just once so far this season, finishing fourth in a Group Three in France last month.