The unbeaten 49ers had been hit with a further main injury to a crucial offensive player as they prepare for their initial division game of the year.

Second-year ideal tackle Mike McGlinchey, a initial-round draft choose in 2018, will have arthroscopic surgery on his ideal knee, coach Kyle Shanahan announced Wednesday. He’s anticipated to miss 4 to six weeks, Chris Biderman of the Sacramento Bee reports.

The news signifies San Francisco (four-) will be without having each beginning tackles for the foreseeable future as veteran left tackle Joe Staley continues to function back from a fractured fibula sustained Week two against the Cincinnati Bengals. The group also lost fullback Kyle Juszczyk to an MCL sprain in Monday night’s victory more than the Cleveland Browns and he’s anticipated to miss at least month.

Daniel Brunskill, who spent the offseason playing for the Alliance of American Football, will be the 49ers’ beginning ideal tackle in McGlinchey’s absence.