Elvis Bwomono made his international debut for Uganda in their 1-0 win over South Sudan on Thursday.
The 21-year-old played the full 90 minutes in the African Cup of Nations qualifier.
Bwomono, who came through the academy, became the 18th Southend player to be capped at full international level while playing for the club.
Only last month he made his 100th appearance for Blues.
Congratulations Elvis on the debut and win.