The 22-year-old is currently in his third season at Old Trafford and has bagged nine Premier League goals from 27 appearances for the Red Devils.
However he has started just 16 times and reports claim that the France international is becoming increasingly frustrated at slipping down the pecking order under Jose Mourinho.
European heavyweights Juventus, Tottenham and Inter Milan are said to be keen on the talented youngster but now, according to Calciomercato, the Bundesliga giants are also on his trail.
The former Monaco ace will enter the final year of his deal at the Theatre of Dreams next season and United will not want to lose him for a cut-price deal next winter.
Domenic Tedesco says Schalke paid the price for missed chances as they were held to a 2-2 draw against Cologne on Sunday.
Jan Oblak says he is happy with Atletico Madrid but refused to completely rule out a move away from the club.
Harry Kane has conceded Tottenham players may have to adopt a fresh approach to big games after another semi-final defeat.
Arsene Wenger has hinted that growing supporter unrest influenced his decision to quit Arsenal at the end of the season.
Swansea boss Carlos Carvalhal says his side's hopes of beating the drop will not suffer following the 5-0 defeat at Manchester City.
Liverpool defender Virgil van Dijk says they are well aware of the threat that Roma possess as a whole, not just Edin Dzeko.
Antonio Conte says his row with Jose Mourinho is a thing of the past as they prepare to face off again in the FA Cup Final.
Paul Lambert believes Stoke will have to win their last three games to have any chance of staying in the Premier League.
Romelu Lukaku believes the current Manchester United squad can win the Premier League title next season saying quality is not an issue.