The San Francisco 49ers improved to 3-0 on the young season, defeating the division rival Arizona Cardinals, 16-15. However, it might prove to be a pyrrhic victory as All-Pro edge rusher Nick Bosa went down with an injury .

Following some tests done on Monday, it has been determined that Bosa suffered a torn ACL , per ESPN's Adam Schefter. His season is officially over. This is the second time that the future Hall of Famer tore his ACL. He previously suffered the same fate in 202 against the New York Jets. Expand Tweet

It's just another blow to a team that has been dealing with injuries all over the field, going back to training camp.

In Week 1, the 49ers lost their starting quarterback. Brock Purdy left their season-opening win with turf toe, but is reportedly nearing a return

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