Marseille man Ekongolo suffered fractured knees in a car crash in Yaounde on Friday.
On Monday, Cameroon tweeted their support for the defender, before announcing that Galatasaray's Chedjou had been called up as a replacement.
He was not included for any of the AFCON qualifiers, but has now been called into Volker Finke's 24-man party, which will have to be cut by one before the finals get underway in Equatorial Guinea on January 17.
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