[1] Teerasil has played his trade in England, Switzerland, Spain, and Japan during his professional football career.

After returning to Manchester City in 2008, he was still unable to play in England, and after the takeover of Abu Dhabi United Group, the Thai trio was released on 16 October 2008.

On 8 March 2009, he made his Thailand Premier League debut, in a 3–0 home win over Port FC, and finished 2009 season with seven goals under his belt.

After his impressive goal tally in the season, Teerasil was invited by La Liga sides Atlético Madrid and Getafe for a trial, but as the former was a Muangthong United partner, he headed to Atletico Madrid in January 2013; he also attracted interest of Turkey club Trabzonspor in June 2013.

[11] Teerasil also watched from the stands an Atletico Madrid win over Real Zaragoza four days later,[12] and returned to Muangthong in February.

Teerasil also played in the 2013 AFC Champions League group stage against Jeonbuk Hyundai Motors, Guangzhou Evergrande, and Urawa Red Diamonds.

He played his last match for Muangthong on 2 July, starting in a 0–1 League Cup loss against Buriram United.

[15] On 21 February 2014, Teerasil signed with Spanish club Almería on a one-year loan deal, making him the first Southeast Asian and Thai footballer to play in La Liga.

[17] Teerasil made his debut in the Spanish top level on 23 August 2014, replacing Fernando Soriano in the 65th minute of a 1–1 home draw against RCD Espanyol,[18] thus becoming the first Thai footballer to do so.

He was handed his first start on 5 December, and scored his side's second of a 4–3 away win against Real Betis, for the campaign's Copa del Rey.

[23] He made his official debut against Consadole Sapporo on 24 February 2018, where his former teammates Chanathip Songkrasin and Jay Bothroyd also plays in the match during the 2018 J1 League and scored the winning goal for his club.

Two years later, he was also included in the under-19 squad which played at the 2006 AFC Youth Championship, scoring the first of two goals in the 2–1 win against the United Arab Emirates; it was Thailand's only victory of the tournament.

In December 2007 he won the U-23 Gold Medal at the Southeast Asian Games, scoring the winner against Myanmar.

[36] However, he only appeared once in the whole tournament, coming on as a late substitute in a 1–1 draw against Iraq; the hosts subsequently failed to progress through the knockout stages, and finished third in Group A. Teerasil was also selected to 2008 AFF Championship; he netted four times during the tournament as Thailand finished runner-up, losing to Vietnam.

He was an ever-present figure in the international fold since October 2007, his second match being a FIFA World Cup Qualifying against Macau, where he scored the second of a 6–1 win.

In the 2014 FIFA World Cup qualifiers, under the management of a newly appointed German coach Winfried Schafer, Teerasil featured constantly and scored against Australia[37] and Oman,[38] respectively.

[41] Teerasil won and scored a penalty for Thailand against FC Barcelona in the Catalans' 2013 Asian Tour in Bangkok.

[42] Teerasil's style of play or role on the field could be described as a striker or deep-lying forward, as he often comes deep down to help the team maintain possession.