The Colombia international looks set to replace Robert Lewandowski at Signal Iduna Park this summer
BVB are in the market for a new striker due to the departure of Robert Lewandowski to Bayern Munich this summer and Ramos is one of the main candidates to replace the Poland international.
Head coach Jurgen Klopp recently already admitted that he is a keen admirer of the Colombian striker and it appears to be a matter of time before the deal is completed following Wennin's latest comments.
"There is a big chance that Adrian will join Dortmund," the 28-year-old's agent told Colprensa.
"But I prefer not to say too much on it until both clubs have officially announced the deal."
Ramos has been in sublime form for Hertha so far this term, netting 15 goals in 25 Bundesliga outings.
The former America de Cali attacker has a contract with his current club until June 2015, but could be available for a fee in the region of €8-10 million.