Buriram United are the defending champions, having won their Thai Premier League title the previous season.
Air Force Central, Singhtarua and PTT Rayong entered as the three promoted teams.
Pattaya United were relegated to the 2014 Thai Division 1 League after finishing the 2013 season.
They were replaced by the best three teams from the 2013 Thai Division 1 League champions Air Force Central, runners-up Singhtarua and third place PTT Rayong.
Bang Kapi, Bangkok Pathum Wan, Bangkok Rajamangala Stadium Thephasadin Stadium 49,722 6,378 Bangkok Thai Army Sports Stadium 20,000 Note: Flags indicate national team as has been defined under FIFA eligibility rules.