WINGER Marcus Selandy-Defour has returned to America after spending a few days training with Derby County.
The 19-year-old, who plays college football in Virginia, was not cleared to play in any friendlies.
"Marcus did well," said Rams manager Nigel Clough.
"The problem was we were not allowed to look at him in a game.
"If there is a chance in the future to do that, we'd like to.
"He is a young winger and very quick. He was recommended to us by our connections in America."
Selandy-Defour has represented the US at under-18 level.