Both Malan and Jordan have been picked for the England T20I squad for their series against the Windies.
Simmons and Mills will be arriving in Dubai tomorrow (27 February).
Lahore Qalandars have included former Netherlands batsman Ryan ten Doeschate as a cover, Doeschate will also be arriving in Dubai tomorrow.
West Indies wicket-keeper batsman Chadwick Walton has been included in the Islamabad United squad.
With Ian Bell out injured and Zahir Khan unavailable from the start of the tournament due to national selection, United have brought in Chadwick Walton as their sixth foreign player in the squad.
Walton, who played for Islamabad United last year, will join the squad immediately and will be available for the remainder of the tournament.