SANTA CLARA — The 49ers made moves Saturday that didn’t provide a lot of clarity as to whether Brock Purdy will be suited up for their home opener against the Arizona Cardinals.

Two players were standard weekly practice squad elevations — quarterback Adrian Martinez and wide receiver Malik Turner. The 49ers also placed offensive lineman Spencer Burford on injured reserve, meaning he would miss at least the next four games with a knee injury.

Coach Kyle Shanahan said Friday that if 49ers wanted Purdy to be suited up as the emergency No. 3 quarterback, then Martinez, by league rules would have to be promoted to the 53-man roster as the backup rather than be called up from the practice squad.

Purdy could still in theory be in uniform, but not have the “emergency third quarterback” designation. It’s more likely he’ll be declared inactive with an eye on the 49ers’ Week 4 game against Jacksonville.

“To make (Brock) the emergency, then I believe Martinez can’t be a flex,” Shanahan said “He’s got to be on the active roster, so that’s why a lot more things go into it also.”

With Martinez indeed being flexed, it would mean losing a roster spot on a quarterback in Purdy who Shanahan said was “highly unlikely” to start. And if Purdy were to play, he’d probably be limited in terms of Shanahan’s play-calling and design.

“I think there’s certain things that he could do, maybe certain things he couldn’t,” Shanahan said. “So, we’re trying to decide if he could do that.”

Purdy came out of a season-opening win against Seattle with right turf toe and a left shoulder injury, although he said Friday the shoulder was no longer an issue.

Against New Orleans, Jones was 26 of 39 for 277 yards, three touchdowns and no interceptions.

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Martinez, 25, earned one of three weekly special practice jerseys Friday which are given to scout team players. Martinez simulated Arizona quarterback Kyler Murray during the week while Purdy was a limited participant behind Jones.

Purdy, wide receiver Jauan Jennings (ankle, shoulder) and left guard Connor Colby (groin) were all listed as questionable Friday. It’s conceivable decisions and Jennings won’t be made until Sunday.

Burford’s placement on injured reserve means that at best he would miss the next four games, and at worse he could need surgery and maybe even be out for the season.

“I just know it didn’t go as well as we wanted it to this week, which is why he is out,” Shanahan said. “We’ll see probably after this weekend whether we’ve got to make a longer-term decision with it.”