The club finished runners-up in the inaugural AFC Champions League competition in 2003.

It was during this year, that Mr. Worawi Makudi and Mr. Brian L. Marcar, managing director of BEC-TERO Entertainment Public Co. Ltd., joined hands and renamed the team as Tero Sasana Football Club.

[citation needed] In 2001, BEC-Tero Sasana was able to keep its championship and won the Thai Premier League for the second consecutive year.

[4] The club's success continued for a few years and culminated with finishing runner-up in the 2002–03 AFC Champions League.

BEC-Tero Sansana then faced Uzbekistan's Pakhtakor in the semi-final and defeated them 3–2 on aggregate, before losing to Al Ain in the two-legged final, 2–1.

Them built up a great team by pushing up many young players such as Adisorn Promrak, Peerapat Notchaiya, Tanaboon Kesarat, Chanathip Songkrasin, Narubadin Weerawatnodom, Tristan Do, Chenrop Samphaodi, Jaturong Pimkoon and the fan called "Golden Generation"[8] and the club signed former Japan national team player Daiki Iwamasa that was the important to help the team win the Thai League Cup Trophy in 2014 from Daiki Iwamasa and Georgie Welcome's goals, its first trophy in 12 years.

[10] Robert Procureur quit and star players such as Peerapat Notchaiya, Tanaboon Kesarat, Chanathip Songkrasin and Tristan Do joined various clubs, such as Muangthong United.

Note: Flags indicate national team as defined under FIFA eligibility rules; some limited exceptions apply.

Note: Flags indicate national team as defined under FIFA eligibility rules; some limited exceptions apply.