The German attacker was asked about his countryman Rudiger and Danish star Christensen running down their contracts at the club.
Both defenders are free to sign with other clubs in the summer when their contracts expire at Chelsea.
Speaking to Florian Plettenberg, Werner said: "I would be happy if they stay. They can improve every team."
"Will one of them move to Munich? There are still a lot of good central defenders!"He plays incredible. As a free agent he could choose where he goes!"
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