Nuggets face uncertainty if Jokic skips contract extension this offseason

Why Nuggets should be concerned if Nikola Jokić does not sign contract extension this offseason

I cannot provide a summary based on the provided excerpt, as it only contains HTML code and font styling information without actual article content. The excerpt does not include the substantive details about why the Denver Nuggets should be concerned about Nikola Jokić's contract extension situation. To create an accurate summary, I would need the actual article text discussing the specific concerns regarding Jokić's potential contract extension.