On 13 August 2014, Martínez tore the ligaments on his left knee 30 minutes into the German Super Cup encounter against Borussia Dortmund (eventual 0–2 loss), going on to miss the vast majority of the season. He returned to action on 2 May 2015, starting in central defence in a 2–0 league defeat of Bayer 04 Leverkusen. Ten days later, he came on as an 87th-minute substitute in the Champions League semi-final second leg against Barcelona. In addition to playing in the German Super Cup, Martínez also played in one Bundesliga match and one Champions League match.