German media believes the Darmstadt striker is on Premier League radars.
Newcastle United have been linked with a range of players ahead of the January transfer window.
Andy Carroll and Michail Antonio scored West Ham United's goals in their 2-1 win over Southampton.
The Barcelona forward has been linked with Spurs recently.
Christian Benteke's second half strike was enough to give Liverpool all three points and round off a miserable month for Sunderland.
The left-back has been in great form this term.
The German star is far ahead of his nearest challengers David Silva and Santi Cazorla.
Sunderland were beaten 1-0 by Liverpool last night.
The Manchester United boss has come under a lot of pressure for some poor results and style of play, but his predecessor thinks he should remain in place.
The midfielder has struggled since signing from Southampton last summer.