In a deal that extends until 2029 with Atletico, the Belgian player has been made available for loan this summer. The management is keen to secure him regular senior football opportunities.
Marca says RB Leipzig are now in advanced talks to take Vermeeren off Atletico's hands for the season.
It's understood RBL are attempting to include a permanent option in the deal.
Vermeeren was left out of Sunday's win against Girona.