That same year he was the leading scorer for the Sierra Leone U-17 team during the 2003 African Under-17 Championship in Swaziland. Sierra Leone lost to Cameroon in the final of the tournament, but they still qualified for the 2003 FIFA U-17 World Championship in Finland. Sierra Leone lost two of the three games at the tournament, including a 2-1 lost to the Freddy Adu-led United States team. Metzger played in all three games and was again the top scorer for Sierra Leone with two goals. Metzger made his senior international debut for Sierra Leone on September 6, 2008 as a substitute replacing Mustapha Bangura in a 2010 FIFA World Cup and 2008 African Nations Cup qualifier as Sierra Leone defeated Guinea Bissau 2-0 in Freetown..he also has play 2 division in Slovakia for MFK TOPVAR TOPOLCANY which he join them second half of d 2009 season en help them coming from relegation which he play eleven games scored five goals and he return Finland now playin for FC VIIKINGIT VUOSAARI in the Finnish ykkonen liga (2 div) he has already score four goals in five games they are in a good position of promoting to the Finnish veikkaus liga (1 div).
On 1 February 2011, Leone Stars striker Obi Metzger Jr. has joined Finnish premier league side, FC Haka on a two-year deal.