Steven Gerrard will make his competitive bow as Rangers manager when Macedonian side Shkupi visit Glasgow for the first-leg clash.
Though the squad registration deadline has passed, two “wildcard players” can be added up to 24 hours before kick-off.
In the meantime the club are waiting on work permits to come through for Sadiq and Coulibaly, who’ll join on season-long loans from Roma and French side Angers, respectively.
Sadiq will look to add some firepower to the attack, while Coulibaly has been described as a playmaking central midfielder.
If both deals can be completed they would become the eighth and ninth signings the club has made this summer.