Reports in Kicker suggests that United have been scouting the highly-rated centre-back in recent weeks.
The Turkey international has a contract with Bayer Leverkusen until the summer of 2018.
Toprak is also reportedly being watched by Bundesliga champions Bayern Munich.
What is your opinion? Feel free to discuss the article under. You have to comment by using your Facebook profile. Be fair and have respect for other people and opinions!
The start of the 2017-18 Premier League season is just around the corner and is shaping up to be one of the most competitive yet.
As always it is the so called “big clubs” that have splashed the most cash in the transfer window so far this summer. Manchester United or City? Arsenal or Tottenham? Who are the winners and losers of the transfer window so far?