
Singapore, who are a point ahead of Thailand in second spot in Group E, play in the return leg four days later.
With regional powerhouse Iran currently topping the section, it was expected to be a duel between Thailand and Singapore to fight for the other qualification spot. Robson trimmed down the provisional list to 20, with Muang Thong United's midfielder Pichitpong Choeichiew, who will serve out his suspension in Saturday's fixture, among those omitted.