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MAIDSTONE, ENGLAND - JULY 15: Crystal Palace manager Frank De Boer talks to Levi Lumeka of Palace before the second half during the Pre Season Friendly match bewteen Maidstone United and Crystal Palace at the Gallagher Stadium on July 15, 2017 in Maidstone, England. (Photo by Christopher Lee/Getty Images)

MAIDSTONE, ENGLAND - JULY 15:  Crystal Palace manager Frank De Boer talks to Levi Lumeka of Palace before the second half during the Pre Season Friendly match bewteen Maidstone United and Crystal Palace at the Gallagher Stadium on July 15, 2017 in Maidstone, England.  (Photo by Christopher Lee/Getty Images)