Borussia Dortmund have offered a contract extension to Mats Hummels as he contemplates whether it is time to leave the club . The Germany international has been on Manchester United 's list of targets for some time but insists he has yet to make a decision . Dortmund CEO Hans-Joachim Watzke is optimistic about extending his stay . 'We continue to plan with him , ' Zorc told German magazine kicker . 'We will continue our dialogue with Mats regarding our collaboration . ' Mats Hummels ( centre ) congratulates his team-mates after they beat Hoffenheim 3-2 in the German Cup . Hummels ( top right ) watches on from the stands as Dortmund reach the German Cup semi-finals . Hummels sat out Dortmund 's 3-2 defeat of Hoffenheim in the German Cup on Tuesday night as Jurgen Klopp 's side booked a place in the semi finals . The 26-year-old has two years left on his contract but revealed earlier in the week that he is still undecided over his future . 'There 's no particular tendency one way or the other . It 's just thoughts going through my mind . It will all become clearer in the coming weeks , ' he told Sky . United are reportedly willing to offer Dortmund up to £30million to sign Hummels , who may be tempted to move in search of Champions League football . Mats Hummels ( right ) has admitted he is considering his future at Borussia Dortmund . The Germany defender has consistently been linked with a big-money move to Manchester United .
Mats Hummels has two years left on deal but is considering his future . Manchester United reportedly ready to pay £30million to sign defender . Hummels missed Dortmund 's 3-2 win over Germany on Tuesday . Franz Beckenbauer : Hummels is the perfect age to join Manchester United . CLICK HERE to watch highlights of Dortmund 's win over Germany .