Odion Ighalo is set to quit Al Shabab for city rivals Al Hilal.
Last season, Al Hilal beat Al Shabab to the Saudi league championship.
Saudi’s most successful club Al Hilal are fourth on the table, three points behind third-placed Al Shabab.
Al Shabab stopped Ighalo from the AFCON in Cameroon, saying his invitation for the tournament was received late.
He will be a direct replacement for Bafis Gomis, who has quit the Riyadh club.
Ighalo, 32, is currently the leading scorer in the league with 12 goals.