Crystal Palace have agreed a fee of £8.5m plus £2.5m in add-ons for Bayern Munich defender Chris Richards, as revealed by Sportsmail.
Richards joined Bayern from FC Dallas but has made just ten senior appearances for the German club.
The centre-back has eight caps for the United States and at the age of 22 has time on his side to develop further.
Bayern's acquisition of Matthijs de Ligt from Juventus has pushed Richards further down the pecking order.
The opportunity to play in the Premier League is hugely appealing for Richards, with Palace boss Patrick Vieira rating him highly.