How much do you remember about Frank de Boer's miserable time at Crystal Palace? By Jonnie Gorrie Published: 12 May 2021, 15:47 share on Facebook share on Twitter share on WhatsApp share on WhatsApp share on Linkedin share on Flipboard share on Messenger share on Email 1 of 15 When was de Boer appointed? 28 June 2017 29 June 2017 27 June 2017 26 June 2017 Crystal Palace Football Quiz News Now - Sport News