Soon after leaving Flamengo for the Bernabeu in 2020, the Brazilian was allowed to spend a two-year spell at the Westfalenstadion in order to receive regular game time.
However, the 19-year-old has made just one start and 23 substitute appearances in all competitions, far below the expectations of Los Blancos officials.
The report suggests that Dortmund will be given the final two-and-a-half months of the year to improve Reinier's situation.
Nevertheless, with the playmaker largely being restricted to cameo appearances thus far, a switch to Portugal in the New Year appears likely. body check tags ::