Ratchaburi v Nakhon Ratchasima
Rayong FC v Buriram Utd
The two-legged ties are scheduled for 18 September and 2 October.
The Rayong FC v Buriram tie will need to be rearranged due to Buriram's involvement in the AFC Champions League.
Edit: It appears that both first legs have been switched to 4 September.