49ers defensive tackle Alfred Collins tore his patellar tendon in practice this week, according to coach Kyle Shanahan. Collins is out for the season.

The 49ers had listed Collins as a limited participant in Tuesday’s practice. (The 49ers are in Australia, so it was Wednesday in Australia.)

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The 49ers have Osa Odighizuwa, CJ West, Gracen Halton and James Thompson Jr. left at the position. In the first official practice of the week, Thompson missed practice with a hamstring injury, and Halton was limited with an ankle injury.

It seems likely the 49ers will call up one of their practice squad defensive tackles — Sebastian Valdez or Kevin Givens — for the game.

Collins, a second-round pick in 2025, played 16 games last season and totaled 17 tackles, one sack, four quarterback hits, an interception, two passes defensed and two forced fumbles.

The 49ers have spent the week in Melbourne as they prepare for Thursday’s season opener against the Rams.