BERLIN (AFP) - Germany winger Marco Reus has ended speculation over his future by signing a four-year extension to stay at struggling Borussia Dortmund until 2019, the Bundesliga club announced on Tuesday.

With Borussia battling relegation after a series of poor league results, there had been speculation he was set to leave at the end of the season.

The 25-year-old had been linked to Dortmund's rivals Bayern Munich, as well as Real Madrid and Manchester United.

But Reus has silenced the speculation by putting pen to paper on a new deal with the eight-time German champions which contains no release clause.

"I am very happy with my decision for Borussia Dortmund," he said.

"Dortmund is my home town and Borussia is simply my club."

Borussia face Italian league leaders Juventus away in the Champions League last 16, first-leg, on Feb 24 with the home leg on March 18, but are currently 16th in the German league.

Reus' new deal is a huge relief for Dortmund's bosses having seen star midfielder Mario Goetze leave in 2013 and the exit of striker Robert Lewandowski last year.