3-1: Castilla get a deserved win over Trival Valderas
Goals from Burgui, Raúl de Tomás and Medrán gave the reserves their first win of the season.
Athetic Club B Real Madrid Castilla 2 Division B Group II
The Whites' reserve side had the best chances in Fuenlabrada, but a goal for the home side from San José and a missed penalty by De Tomás saw them leave empty-handed.
Like the first team, Madrid will take on Basel, Liverpool and Ludgorets in the Group Stage.
Markkanen scored a header for the Madrid outfit that paid for a lack of finishing prowess against a Getafe B side that made the most of its chances.
Raúl de Tomás put Madrid in front in the first half, but the Atlético reserves turned the game around after the break.