[2] Having never made a competitive international appearance, Appiah remains eligible for New Zealand, Australia and Ghana.

Appiah was a part of the 2011–2012 Central Coast Mariners, A-League National Youth League winning squad in which he scored 9 goals throughout the season.

[3] On 6 October he made his A-League debut against his former youth club, Central Coast Mariners, in the Wanderers' first ever competitive match.

On 31 January 2015, Appiah left Western Sydney Wanderers, with the players contract terminated by mutual consent.

[6] At the end of his contract, Appiah was released by the Phoenix, and subsequently returned to Central Coast Mariners on trial.