The 21-year-old winger, who previously played for Manchester City's youth team, has a high market value of £80 million. However, Dortmund is believed to be willing to sell him for a lower price, between £35 million and £45 million.
Other clubs, including Tottenham, are also keeping an eye on Gittens' situation. There are reportedly tensions between the player and Dortmund's coach Niko Kovac, who was appointed recently.
Gittens' contract with Dortmund runs until 2028, giving him a few more years to develop his skills before potentially moving to a new team.