"It's false," said the sporting director of Hertha, Michael Preetz, ahead of their crucial Bundesliga clash with Wolfsburg at the weekend.

A number of reports in the German and international media have claimed in the last few days that the current top scorer in the Bundesliga had agreed a four-year contract with Dortmund to begin in the summer, when Robert Lewandowski will leave the Signal-Iduna Park to join Bayern Munich.

Ramos, 28, is having his best season in Germany since moving there five years ago from Colombian club America de Cali.

He has scored 14 goals, including seven in his last six league matches, leaving him one ahead of Lewandowski.

Hertha are currently in an impressive seventh place on their return to the Bundesliga after gaining promotion from the second tier last season.