Minnesota Vikings rookie quarterback J.J. McCarthy suffers knee injury, placing his availability for the upcoming season in doubt.

Why it matters: The injury to McCarthy has significant implications for the Vikings' quarterback situation and their plans for the upcoming season.

• McCarthy's injury during the preseason game against the Raiders raises concerns about the team's depth at the quarterback position.
• The uncertainty surrounding McCarthy's status adds pressure on veteran quarterback Sam Darnold, who is expected to step into the starting role.
• The outcome of McCarthy's surgery will determine the severity of the injury and the length of his absence from the field.

What's new: Coach Kevin O'Connell confirms McCarthy's knee injury and states that a final determination of his availability will be made post-surgery.

• The extent of the injury will be assessed during the surgery, with possibilities ranging from a meniscus trim to a full repair.
• O'Connell expresses trust in the medical staff and emphasizes that the decision on McCarthy's availability rests on medical evaluations.

Yes, but: With McCarthy sidelined, the Vikings will heavily rely on Sam Darnold as their starting quarterback.

• Darnold has been performing well in training camp and has gained the confidence of the coaching staff.
• The injury to McCarthy provides an opportunity for Darnold to showcase his skills and solidify his position as the team's leader on offense.

What to watch: The Vikings' quarterback situation will be closely monitored in the coming weeks as McCarthy undergoes surgery and Darnold assumes the starting role.

• The performance of Darnold in preseason games will be crucial in assessing his readiness for the regular season.
• The development of backup quarterbacks Nick Mullens and Jaren Hall will also be worth observing given the uncertainty surrounding McCarthy's return.

What's next: The focus for the Vikings will be on supporting McCarthy's recovery and preparing Darnold for the upcoming season.

• The team will continue to monitor McCarthy's progress and adjust their plans accordingly.
• Darnold will have the opportunity to establish himself as a capable starting quarterback and lead the Vikings' offense successfully.

The bottom line: McCarthy's injury places the Vikings in a challenging position, but it also provides an opportunity for Sam Darnold to showcase his abilities and take charge of the team. The success of the Vikings' season may hinge on Darnold's performance and the development of their backup quarterbacks.