SANTA CLARA, Calif. -- The 21-day evaluation window on All-Pro inside linebacker NaVorro Bowman closes on Tuesday, and as of Monday afternoon, the San Francisco 49ers had yet to make a decision on whether to activate him or shut him down.

“We’re going to discuss that this afternoon,” coach Jim Harbaugh said in his weekly media conference on Monday. “Let all the medical [personnel] weigh in today and then make decisions.”

Bowman, who tore the ACL and MCL in his left knee in January’s NFC title game, has not practiced since his window was opened three weeks ago, lending credence to the notion that he will not play this season.

Harbaugh and defensive coordinator Vic Fangio have said there has not been a setback in Bowman’s recuperation, even if the team initially targeted midseason for him to make his debut.

Technically, the 49ers could activate Bowman to the 53-man roster but de-activate him on game day until he’s ready, even if the Niners have only three games remaining.

Harbaugh, though, said he would not make a decision on Bowman contingent upon the Niners’ playoff chances. For example, why activate Bowman if they are eliminated? They are currently three games behind the Arizona Cardinals in the NFC West and two games out of the wild card chase.

“I think it will be based medically, on where his status is, and what’s best for his football career, now and in the future,” Harbaugh said.

He added that preliminary reports on injuries suffered by center Marcus Martin (knee) and cornerback Chris Culliver (knee) in Sunday’s 24-13 loss to the Oakland Raiders were “positive.”