Crystal Palace signed 19-year-old attacking midfielder Romain Esse from Millwall on Saturday.
Esse signed a 5 ½-year contact with the Premier League club after scoring five goals for Millwall this season.
Palace didn't release financial details but reports said the transfer fee was at least £12 million ($14.6 million).
"Romain is the type of player who gets crowds off their seats," Palace chairman Steve Parish said in a team statement.
Palace, in 15th place, play at West Ham on Saturday.
Esse won't be available for selection until next weekend's match against Brentford.