Reinier joined Real Madrid from Flamengo in January 2020 at a fee of £27m having been touted as one of the brightest young prospects in world football.
The 19-year-old spent the next few months in the club’s Castilla set-up.
Then, a decision was made for him to continue his development away from Santiago Bernabeu.
Dortmund then snapped the midfielder up on a two-year loan deal in August, but he has so far been unable to make an impact in Germany.
Reinier has only featured in eight games across all competitions for Dortmund so far this season.
He is yet to open his scoring account, leading to speculation that Madrid could cut his time with the Bundesliga giants short.
It has been reported that the Blancos are looking to send the teenager out on loan to Real Valladolid instead.
But Dortmund sporting director Michael Zorc shut down those rumours earlier this month.
“We basically don’t want to give him up,” Michael Zorc said.
“If someone is dissatisfied because he has too few opportunities, then you talk to each other, but we will not take the initiative ourselves,” he added.
Reinier set to stay
Reinier has made it clear that he wants to remain at Westfalenstadion, and Madrid are happy for him to have the final say on his short-term future.
The La Liga champions anticipated that the Brazilian would need time to adapt to his new surroundings.
They will therefore remain patient with him as he seeks to prove himself in one of Europe’s top leagues.
Valladolid were not the only club interested in offering Reinier a different route.
His agent Giuliano Bertolucci had explored a number of different options, but Dortmund will continue to nurture him.