Lukasz Piszczek - Poland
One of the best Polish footballers in the world, Piszczek is poised to make his 45th career appearance for Poland next week. Scoring two goals for Poland during World Cup qualifying in 2013, Piszczek has been a mainstay on the Polish backline. He was one of the best players for the White Eagles at the 2012 Euros, and will look to make 2016 even more special.
Jakub Blaszczykowksi - Poland
While on loan at Fiorentina, Kuba is still under contract with Dortmund and has been called up to the Polish national team. Capped 75 times by Poland, Blaszczykowski has recorded 15 international goals. He is the most tenured active player for the White Eagles, who face Serbia and Finland in a pair of friendlies in Poland.
Sokratis Papastathopolous - Greece
After returning from a hamstring injury last weekend, Sokratis will represent Greece next weekend. The Greeks will host a pair of friendlies against Montenegro and Iceland in Piraeus, Greece; home of Olympiacos. Sokratis has earned 62 caps for Greece, scoring twice. He started all four games for Greece in the 2014 World Cup, scoring in the round of 16 against Costa Rica.
Roman Bürki - Switzerland
Roman Bürki became Dortmund's first choice keeper this season after dethroning Roman Weidenfeller. Now, Bürki will hope to become the Swiss starting keeper in time for the Euros. Bürki will compete with Yann Sommer and Marwin Hitz for the starting job. The goaltender has been called up for next weeks friendlies against Ireland and Bosnia.
Shinji Kagawa - Japan
With the Asian Confederation in the midst of World Cup qualifying, Kagawa has been called up for matches against Afghanistan and Syria in Saitama. Kagawa is one of Japan's top players and will be instrumental next week during World Cup qualification. Playing in two AFC Asian Cups, a Confederations Cup, and a World Cup, Kagawa has been capped 77 times, scoring 23 goals.
Park Joo-ho - South Korea
Despite not being one of Thomas Tuchel's top-choice defenders, Park Joo-ho has earned an international call-up with South Korea as they prepare to face Lebanon and Thailand in World Cup qualifying. Capped 28 times, Park featured in the 2014 World Cup for South Korea.
Adrian Ramos - Colombia
Colombia will face Bolivia and Ecuador in World Cup qualifying and will be paced at striker by Adrian Ramos. Ramos hasn't played much with Dortmund, but has been capped 36 times by Colombia, scoring four goals. Ramos started once in the World Cup, and made two substitute appearances in the knockout stage.
NOTE: Armenia (Henrikh Mkhitaryan) and Italy (Ciro Immobile, on loan) have yet to announce their friendly rosters for next week.