Dortmund - Returning Borussia Dortmund quartet , , and were all involved in a 3-2 friendly win over Viktoria Köln on Tuesday.
Neven Subotic, Sven Bender, Kevin Großkreutz and Dong-Won Ji also lined up against the regional minnows, with Reus, Mkhitaryan and Julian Derstroff on target for Jürgen Klopp's high-profile hosts.
"I'm available," affirmed Gündogan after the game. "The plan is to dive right back in as soon as the internationals return. I'd like to think I'll be in the squad to face 1. FC Köln at the weekend." The 23-year-old midfielder only returned to first-team training on Monday after over a year on the sidelines with a back problem, while Reus, Mkhitaryan and Kehl last featured for die Schwarz-Gelben on Bundesliga Matchday 2 and 4 and in September's UEFA Champions League group stage win over Arsenal FC respectively.