The defender has penned a new deal to 2031 in the last 24 hours.
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Flick said, "From the start of the season, we could already see his potential.
"He was initially hampered by injuries, but in the end, he’s a very professional player, it’s fantastic to see.
"When you want to be a leader, it’s also important to be disciplined and give everything for the team, regardless of whether you play full-back or defensive midfielder…
"I’m very happy for him, he deserves to extend his contract and it’s excellent news for everyone.”