The attacking midfielder has been heavily linked with a move to the Bundesliga side, but his current club has received no formal bid as of yet.
Reports from Denmark earlier this week suggested that BVB had tabled a bid in the region of 12 million euros for the attacking midfielder, but Ajax has made it clear the club is still awaiting a formal approach from the Champions League finalist.
"The Danish press publishes all kinds of stories, but Dortmund have not made a formal offer for Eriksen," Overmars told Algemeen Dagblad.
The 21-year-old has a contract with Ajax until June 2014, but the Amsterdam giant is ready to cash in on the midfielder this summer if a good offer comes in.
Aside from Dortmund, Eriksen has also caught the attention of Premier League sides such as Tottenham and Liverpool.