Jurgen Klopp is looking for January reinforcements as his side prepares to battle on all fronts during the second half of the season, and it appears the Black Cats forward is an attractive option.
Ji Dong-Won is out of contract at the Stadium of Light in the summer, and is unlikely to be offered a new deal by manager Gus Poyet.
Dortmund hope to secure the forward’s signature for a knock down price in January, as the striker enters the final six months of his Sunderland contract.
The 22-year-old has made just four appearances for the north east club this season, with his last start coming under former boss Paulo Di Canio way back in August.
The striker has been capped 22 times for South Korea, and moved to the Stadium of Light from Chunnam Dragons in 2011.
He is best remembered for scoring a last minute winner against Manchester City at the Stadium of Light on New Years Day 2012.