Champions League winners Toni Kroos and Antonio Rüdiger joined German Euro 2024 training on Wednesday and aim to boost the team with their Real Madrid winning mentality. “What we can take with us from Madrid is the killer instinct,” centre back Rüdiger told reporters. Real won a record-extending 15th title in the elite event on Saturday, 2-0 over Borussia Dortmund, ruthlessly deciding matters late in the game like so often before, and after earlier being outplayed by Dortmund who paid for not scoring. The full squad, which also includes the Dortmund pair of Nico Schlotterbeck and Niclas Füllkr…