The Reds boss has denied he has an agreement with his former club.
The German boss has been linked with a number of his former players since taking over from Brendan Rodgers at Anfield.
Midfielders Sven Bender and Marco Reus, as well as defenders Mats Hummels, Neven Subotic and Lukasz Piszczek have all been the subject of rumours about a potential move to Anfield.
A deal for any of those looked unlikely though, with it being suggested there was a deal he would not go back to raid his old side.
He has now though, revealed there is no such deal in place and he could theoretically attempt to sign players from Dortmund.
“I have no agreement with Borussia Dortmund,” the Mirror reports him as saying.
“I heard about an agreement, but no. Yet in my opinion it only makes sense to go for players we think we can get.”
“There is nothing between us and if there was a possibility that we could get one of those players AND we needed him, then we could try it.”
It is as yet unknown whether Klopp will look to improve his squad in the January transfer window.
If he were to make any signigns, it is likely he would look to improve his options up front given Liverpool’s struggles in that department.
Questions still remain over the long-term fitness of Daniel Sturridge, while Christian Benteke is yet to firmly establish himself in the side.