Sage was appointed in June on a three-year contract after impressing with Lens, whom he guided to second place in Ligue 1 and the Coupe de France, but has struggled to get his ideas across this season.
Former Tottenham and Brentford manager Thomas Frank is the favourite to replace Sage, with England assistant coach Anthony Barry also a strong contender.
Next Crystal Palace manager odds
(Odds via BetVictor, subject to change.)
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