On loan right-back Enner Valencia has been called up for his country's friendly against the United States in Connecticut this Friday. They then face El Salvador on 14 October in New Jersey.
Valencia has an impressive international goalscoring record, with seven goals in 13 appearances, including three at the 2014 World Cup in Brazil.
Development Squad winger Kieran Sadlier has been called up to play for the Republic of Ireland U21 squad as they face Norway in a friendly on 9 October. Sadlier made his U21 international debut earlier this year having made the step up from the U19s.
Northern Ireland U19 international Jamie Harney has also been called up. The U19s face a busy week as they host the Czech Republic, Russia and the Faroe Islands between 9-14 October.
Reece Burke is the fifth Hammer to report for international duty this week. The second year scholar is part of England's U19 squad for their UEFA U19 Championship qualifying round fixtures against Belarus on Friday 10 October, Luxembourg on 12 October and Belgium on 15 October. All three games will be played in Luxembourg, with the top two nations progressing to the Elite Round next Spring.
Finally, James Collins has pulled out of Wales' squad for their Euro 2016 qualifiers against Bosnia-Herzegovina and Cyprus after suffering a groin injury.