The injuries just continue to pile up for the San Francisco 49ers at this early stage in the season.

Now, as noted by the NFL Network's Ian Rapoport, 49ers linebacker Dre Greenlaw is slated to miss six to eight weeks of action due to a groin injury. He is expected to soon undergo a procedure for his core muscle injury.

There was already a notable concern for Greenlaw following the 49ers' dramatic Week 1 win over the Detroit Lions. The third-year linebacker out of Arkansas shined in the contest with six tackles and an interception off of Lions quarterback Jared Goff that was returned the other way for a key first half touchdown.

However, Greenlaw did leave the game due to a groin injury. He missed practice on Wednesday as he was considered day-to-day with the nagging injury.

Now, barring any last-minute changes, Greenlaw is slated to undergo surgery but is on par to be back over the second half of the season.

Greenlaw emerged as a vital player for the 49ers over his opening two seasons in the league; he recorded 22 starts in 29 games played. But for now, the likes of Demetrius Flannigan-Fowles and Marcell Harris are expected to be called upon to step up on the defensive end with Greenlaw out.

The 49ers are currently set for another early season road game, as they will clash with the Philadelphia Eagles in Week 2.