Chatchai was called up several times by Thailand's former coach Winfried Schäfer.

In 2013 Chatchai was called up to the national team by Surachai Jaturapattarapong to the 2015 AFC Asian Cup qualification.

In May 2015, he was called up to Thailand to play in the 2018 FIFA World Cup qualification (AFC) against Vietnam.

However, he suffered an injury sidelining him for 8 months, while playing against Vietnam in the second leg of the tournament's semi-finals.

[3] Thai football fans have noted him as a goalkeeper who plays well with his feet and can intercept the ball outside the goal line.