Aaron Donald is making the Los Angeles Rams sweat. The star defensive lineman, widely regarded as the most disruptive force in the NFL, declined to commit to playing in Sunday's season opener against the San Francisco 49ers. When asked directly whether he would be on the field, Donald offered a characteristically noncommittal reply. "I'm feeling good," he said. "We'll see how it goes. I'm just taking it day by day."

That stance puts the Rams in a delicate position. Donald has been limited in practice this week with what the team describes as a minor lower-body issue. While he has not been ruled out, his reluctance to give a definitive answer raises questions about his readiness for a full workload. For a player who has missed only a handful of games in his career, the uncertainty is notable.

McVay, however, struck a more confident tone. "I expect Aaron to play," the head coach said. "He's a competitor. He knows what this game means. We're going to be smart about it, but I fully anticipate him being out there with his teammates."

The 49ers are preparing for both possibilities. San Francisco's offensive line has been bolstered by the return of Trent Williams, but facing Donald at less than 100 percent is still a nightmare. Even when limited, Donald commands double-teams and alters game plans. If he sits, the Rams will rely on a rotation of younger interior linemen, a group that has yet to prove it can generate pressure without him.

Donald's history adds context to the mystery. The 32-year-old has been nursing a nagging ankle issue since training camp, and the team has been cautious with his workload. He played only about half the defensive snaps during the preseason. Yet Donald has earned the benefit of the doubt; over the past decade, he has appeared in every game that truly mattered, often playing through pain.

The timing of the season opener amplifies the drama. The Rams are coming off a disappointing season, and a strong start against a division rival is critical. McVay has emphasized that the team will not force Donald onto the field if he is not ready, but the message from the locker room is clear: they want their anchor.

Donald himself seemed unfazed by the media attention. "I know what I can do. I know what I need to do to help this team win. Whether that's this week or next week, I'll be ready when it matters," he said.

The 49ers, meanwhile, are treating Donald's status as a variable they cannot control. Defensive coordinator Steve Wilks said the team has prepared two different game plans. "We have to be ready for both. If he plays, we adjust. If he doesn't, we adjust. That's just the nature of this league," Wilks noted.

For now, the Rams wait. Donald will test his ankle in a final practice before the game. McVay said a decision will come down to Sunday morning. Until then, the only certainty is uncertainty.