noun / verb
debut
day-BYOO/deɪˈbjuː/
A first appearance before the public, or to appear publicly for the first time.
The violinist makes her debut with a first entrance onto the stage.

Etymology
French début grew out of débuter, meaning to make the first stroke at billiards or lead off at bowls. That opening move became an image for someone's first public appearance or performance.
In context
getting his number 26 and even getting called up to get his international debut for the Belgian national team in March 2009