Due to his heritage Matkin was able to represent the
United States,
Mexico, and
Guam. After seeing that his chances of playing for the United States and Mexico fell short he decided to accept Guam's offer to be called up to represent them during the
2014 AFC Challenge Cup qualifiers to be held on 2 March 2013. Matkin then made his debut for Guam on 2 March 2013 against
Myanmar in the first match of the qualifiers in which he started and played the full 90 minutes as Guam lost the match 5–0. He scored his first international goal on 25 July 2014 against
Northern Mariana Islands during the
2015 EAFF East Asian Cup qualification at the
GFA National Training Center.
International goals :''Scores and results list Guams's goal tally first.'' ==References==