According to ESPN FC, Dortmund are open to offers for Hummels and that the German international is keen on a move to the Premier League.
The report goes onto state that United are also interested in signing Gündoğan who is set to leave this year.
Dortmund have had a long-standing policy of only selling one of their star’s per season however, the lack of UEFA Champions League football may force their hand to offload a number of their players.
Serie A giants Juventus and Bayern Munich are also reportedly interested in the 24-year-old Germany international.
Gündoğan has four assists and three goals in 29 appearances for Dortmund this season.