The San Francisco 49ers injury situation is already becoming untenable and they're only six days into training camp. Capping off a terrible day of injury news for their rookies, undrafted rookie defensive end Mikail Kamara was taken off the practice field on a cart per the Athletic's Matt Barrows. Kamara was perhaps the most interesting player in the 49ers' undrafted rookie class after racking up 22 tackles for loss and 12.0 sacks during his final two season with the Indiana University. For now it's only classified as tightness and the team will be extra cautious with its players early in camp. More 49ers: He's officially back: WR Deebo Samuel signs 1-year contract with 49ersThis article originally appeared on Niners Wire: 49ers have horrendous injury news for four rookies