Photo Credit: 49ers – Terrell Lloyd

It was just “maintenance.” At least, that’s what the 49ers thought. As tight-lipped as the organization is attempting to be this season, given the limited information opposing teams have on their players, it does not appear that they were not lying about the health of Nick Bosa. Bosa was held out of practice on Saturday and Sunday with the cause being that maintenance. He was not present in practice on Tuesday, ringing the alarm bells.

Head coach Kyle Shanahan said that Bosa had some soreness, which the team evaluated, and after an MRI, revealed he had a muscle strain. He is expected to be “week-to-week,” as is receiver Brandon Aiyuk, whose injury diagnosis was better than expected. Shanahan said the 49ers thought he would have a somewhat serious pulled hamstring, but described Aiyuk as having a “mild” strain of that hamstring, putting him in that same week-to-week boat.

With Friday representing the last day of training camp, both have seen the end of their time in training camp. There is one more week, next week, in which game preparation begins before roster cuts are due on September 7, which can function as a quasi-training camp, with a following week before the season opener against the Arizona Cardinals.

Shanahan is “still hoping on Week 1” for a Deebo Samuel return.

Dee Ford was also absent from practice. After a 1-on-1 rep against Mike McGlinchey on Sunday, Ford pulled up limping, holding his right calf. He was held out of the remainder of practice as well as Tuesday’s practice. He is day-to-day, Shanahan said.

“Dee Ford had calf irritation, had it the last couple days,” Shanahan said. “Went through it two days ago and then yesterday came out for warmups and was just a little bit too tight and we didn’t want to risk it two days ago and we gave him today off for it also, so he’s day-to-day with it, hopefully will be back soon.”

Raheem Mostert sat out of practice with a vet day. No injury concerns there.

Ross Dwelley was also absent from practice. While there was no update on Dwelley’s foot, the team signed tight end Erik Swoope for depth, putting Dwelley’s injury from the minor concern category to major. His roster spot is now in serious question with a fantastic performance from Jordan Reed in his first day of pads and rookie Charlie Woerner improving daily.