The Colombia international has been in Germany since 2009 - during which time he has been a regular source of goals.
He has already netted 11 times in 17 appearances this season and is believed to be attracting admiring glances from afar.
Borussia Dortmund have been credited with holding an interest in the 27-year-old, but leading lights from the Premier League are also said to be keen.
Ramos has hinted that that he would prefer to leave the Bundesliga if a move is made, but the South American is reluctant to speculate on what his future may hold while he is tied to a contract at Hertha.
He told El Tiempo: "I am under contract with Hertha Berlin until June 2015.
"But everyone knows that the Premier League is the best league in the world. Which player would refuse to play there if he receives an offer to do so?"