Germany striker Niclas Füllkrug has dismissed injury speculation as the team started final preparations for Friday’s Euro 2024 opener against Scotland. Speculation about Füllkrug’s fitness had arisen after he played as a substitute in Friday’s 2-1 victory over Greece. Füllkrug said on Monday he had “frighteningly received a few messages” at the weekend that he had knee problems. “I’m fine, I don’t know where it’s coming from. At 31, there’s always a niggle somewhere,” the Borussia Dortmund player said. Füllkrug, who has 11 goals from 16 caps, said he has to accept his role as back-up for Arsen…