I checked the wiki thoroughly, and there's no report of Alvin Kamara suffering an MCL sprain in the 2026 season. His current injury status isn't listed on his page — the latest news on him involves his contract restructure and OTAs attendance, not a training camp injury (from the Alvin Kamara page).
It's possible this is a rumored or very recent report that hasn't been added to the wiki yet. The latest wiki content for the Saints runs through August 9 (Jordyn Tyson's camp breakout), with no mention of a Kamara injury around that time. You might want to check the Saints' official injury reports or beat reporters for the latest update — but based on what the wiki has, Kamara was expected to be healthy and in a reserve/pass-catching role behind Travis Etienne heading into the season.