The France midfielder has been linked with Liverpool and Real Madrid in recent weeks.
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But Eberl, speaking with ZDF over the weekend, insists Olise is not for sale.
He stated: "Michel Olise is absolutely untouchable. For us, there is not a second of doubt about it. It is developing excellently."
Olise boasts a record of 19 goals and 29 assists so far in the 2025-2026 season with Bayern.
The midfielder left Crystal Palace 18 months ago for Bayern.