"Generally we have agreed terms with Barrios and his club. Now the only thing left is the medical check," Dortmund sports director Michael Zorc told Ruhr News newspaper.

Jurgen Klopp's side moved for Barrios to fill the void left by the departure of Swiss marksman Alexander Frei, who joined FC Basel earlier this week.

Barrios, who scored 37 goals in 38 matches for Colo Colo last season, could partner Egyptian forward Zidan in Dortmund's frontline next season.