Germany international Marcel Schmelzer has signed a five-year contract extension to keep him at Borussia Dortmund until 2021.

The 28-year-old has made 195 appearances for Dortmund in Germany's top flight, including 23 Bundesliga matches this season with Borussia second behind Bayern Munich.

The left-back was part of the team which won the 2011 Bundesliga, the 2012 league and cup double, then reached the 2013 Champions League final.

"This is a team full of character and this club is totally unique. I'm delighted to be able to be a part of things in the future here," he told the club's website.

"My family and I have felt at home here for years. Dortmund is my sporting home and always will be."

Schmelzer's signature is a boost to Borussia who are hoping stars Mats Hummels, Ilkay Gundogan and Henrik Mkhitaryan will all sign contract extensions before the end of the season.

Schmelzer, who won the last of his 16 caps for Germany in 2013, is one of Dortmund's longest-serving players, having made his debut back in August 2008.