Barrios joins the German side in a €4.4million deal.
The 24-year-old has signed a four-year contract with Borussia.
Barrios has impressed at Colo Colo, since joining the club from Mexican side Atlas in 2008.
Barrios joins the German side in a €4.4million deal.
The 24-year-old has signed a four-year contract with Borussia.
Barrios has impressed at Colo Colo, since joining the club from Mexican side Atlas in 2008.
