Maatsen joined BVB on-loan in January.
The 22-year-old's father Edward Maatsen told Voetbal International: "We are working on staying at the club (Dortmund).
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"The clubs must resolve it among themselves. Ian is developing well here and things are not going well at Chelsea since the change of ownership. A lot in that club also revolves around money, which sometimes seems more important than the interests of the club.
"We have more options besides Chelsea and Dortmund, but Dortmund has proven to be a good restart.
"And see which guys come from there. (Jude) Bellingham, (Erling) Haaland"