The 24-year-old spent the entirety of last season on the sidelines with a back injury but has made 30 appearances for Dortmund this term.
According to SportBild, Manchester United still have worries regarding Gündoğan’s fitness. The report goes onto say that Bayern Munich and Manchester City are also concerned about the German internationals injury record.
Gündoğan, who has been linked with a €30 million move to Manchester United from Borussia Dortmund by the Metro, played a staring role in his sides 2-0 victory over Hertha Berlin last week.
The Germany international has four assists and three goals in 30 appearances for Dortmund this season.
Dortmund sit in 9th place in the League with 40 points from 31 games. The Bundesliga Giants no longer have a chance of participating in the UEFA Champions League next season.