The 22-year-old Frenchman is a highly-rated defender despite his injury problems and clubs have continued to keep their eyes on him.
He has six months left on his contract at Dortmund and the German club are in talks with the defender over a new deal.
But Zagadou is being courted by several other clubs and Manchester United are in talks with the defender’s agent over the possibility of signing him on a free transfer next summer.
And according to French sports daily L’Equipe, Zagadou is being tracked by another Premier League team in the shape of West Ham.
The Hammers are in the market for defenders this month and are keeping their eyes open on several options.
Zagadou’s name has been doing the rounds inside their recruitment meetings as a potential signing.
The Hammers are keeping a close watch on what happens with him at Dortmund regarding his contract.
It remains to be seen whether the east London club make a daring move to sign him in January.
