The Canada international, 33, joined the Cottagers from Everton in 2004 and made over 100 appearances.
He joins Claus Jensen in being released by Sanchez and, like the Danish midfielder, Radzinski rejected an extended deal at Craven Cottage earlier in the season.
© Copyright PA Sport Ltd 2007, All Rights Reserved.
Do YOU want to write for GiveMeSport? Get started today by signing-up and submitting an article HERE: https://www.givemesport.com/writeforgms