The Football Association of Wales confirmed the news on its Twitter page, giving no reasons for the withdrawals.
🇨🇳 China Cup Squad Update | Diweddariad Carfan Cwpan Tsieina— Wales 🏴 (@Cymru) March 17, 2018
Adam Matthews has been called up to the China Cup squad while Neil Taylor, Tom Lawrence, Joe Ledley and Ethan Ampadu have all had to withdraw. #TogetherStronger pic.twitter.com/cZ8RX9sdgY
Wales face hosts China on Thursday, March 22 and either Uruguay or Czech Republic on Monday, March 26.