Sevilla were the first club to register an interest in the promising 20-year-old when they lodged a £2.7million bid last week.
However, Tottenham have since weighed in with an offer thought to be worth double that to put the approach of the reigning two-time UEFA Cup champions in the shade.
Sevilla have since upped their offer, but Hertha general manager Dieter Hoeness favours the deal put together by the north London club.
"The offer from Sevilla never interested us," said Hoeness. "It was not enough, so we turned it down.
"We have accepted the offer from England and now the club and the player must reach an agreement."
Boateng admits he was preparing himself for a move to Spain, but concedes that Sevilla's capture of Lens midfielder Seydou Keita, coupled with Tottenham's interest, has prompted a rethink.
"We were quite advanced with Sevilla," Boateng told the Berliner Zeitung newspaper.
"I have heard that (Seydou) Keita is joining, so I don't know if that has any effect on me.
"The Premier League is actually my dream league and now I am thinking about Tottenham."
Boateng has made 43 first-team appearances in two years as a professional with Hertha, scoring four goals, and earned his first cap for Germany's Under-21s against England last October.