Reus, a Dortmund youth player who joined the senior team in 2012 from Borussia Monchengladbach, has become their talismanic leader despite an injury-plagued career.
He has lifted two German Cups but with Dortmund now a point clear at the top of the Bundesliga standings with five matches remaining, the most skilled German attacking midfielder of his generation is eyeing what would be his first ever league crown.
With 161 goals in all competitions in his Dortmund career he is just 16 shy of the club's record.
"As a team, we – just like all of our fans – have a big goal on our minds right now which our full focus is on: we want to become German champions," Reus said in a club statement.
"But beyond that, I still really want to do my best for the club I've spent over half my life with.
"There’s still nothing better for me than scoring goals in front of the best fans in the world in the most beautiful stadium in the world and celebrating victories together," he added.
Dortmund next play Bochum in the Bundesliga on Friday - a game you can follow with Flashscore.