SANTA CLARA – Three men walked into a bar … or maybe they wish they did.

Kyle Shanahan, Robert Saleh and John Lynch came together at midfield and gazed at the 49ers’ defensive players they had left for Thursday’s practice, under almost sarcastically sunny skies.

Of course, that unit presses on without Nick Bosa, Fred Warner and Mykel Williams the rest of this season. But two more defensive mainstays missed Thursday’s session: linebacker Dee Winters (knee, knee) and defensive tackle Alfred Collins (hip).

Also added to the injury report after limited duty were just-acquired defensive end Keion White (groin) and defensive tackle Kalia Davis (ankle).

Alas, more reinforcements could be needed on an ever-changing defense, one that must bond fast Sunday when the 49ers (6-3) host the Los Angel

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