It saw reports emerge of the Westfalenstadion team identifying Stuggart youngster Tanguy Coulibaly as a replacement.
But Dutch outlet Soccer News have said that a former Gunners player is also in Dortmund’s sights.
PSV Eindhoven forward Donyell Malen has been leading the club’s line for the last three seasons, scoring 43 goals in 93 appearances.
Helping his side win the 2017/18 Eredivisie title, it has seen the 21-year-old earn six Holland appearances.
But his career started with Arsenal in their academy, arriving from Ajax in 2015, impressing during the FA Youth Cup to earn a professional contract a year later.
And the forward made an impact, scoring 14 goals in 30 appearances.
His time in the senior squad, though, was limited to just one pre-season appearance win over Sydney in July 2017.
It led to a transfer by the north London side to PSV the following month, where he has only got better.
Despite missing most of last season with a knee injury, Malen still scored 17 goals and made nine assists.
This form has continued for the 2020/21 campaign – and the report states it has piqued Dortmund’s interest.
The German side have been impressed with his added ability to create chances, having made six assists this season, describing the Dutchman as a “unique player”.
With Sancho recording 20 goals and 20 assists last season, it is no surprise the rounded player has the “most concrete interest” from the Black and Yellow.
The Englishman was the focus of the summer transfer window, commanding a £120m fee for United.
And the 20-year-old has admitted that he has found it tough since the failed move to Old Trafford.