Striker Jordan Ayew looks set to join his brother Andre in departing Swansea City following their relegation from the Premier League
Riedewald started four league games last season after a move from Ajax.
Ayew, 26, will depart alongside brother Andre Ayew, who completed a loan to Fenerbahce last week.
Sources close to Ayew are saying he will leave the Liberty Stadium by the close of the transfer window on 9 August.
Swansea manager Graham Potter is hoping to sign Brentford midfielder Ryan Woods after completing deals to sign Bersant Celina and Barrie McKay.