SANTA CLARA — Perhaps foreshadowing his best combinations this season, Colin Kaepernick completed back-to-back, deep passes to Anquan Boldin and Vernon Davis on Tuesday at training camp.

Davis, however, remains a tight end by trade, and there isn’t evidence of him being converted into a wide receiver.

Thus, the 49ers must still find a true, No. 2 wideout. That task is growing dreary as minor injuries mount among the candidates.

A.J. Jenkins, last year’s first-round pick, and Kassim Osgood, an 11th-year veteran, both injured their right hamstring during Tuesday’s warmups and missed the rest of practice.

Already on the sideline for a second straight practice was Kyle Williams, who tweaked his right hamstring on Saturday. Ricardo Lockette practiced through hip pain, and Quinton Patton again isn’t seeing passes come his way because of an injured finger.

Wide receiver is such a focus because the 49ers are expected to start the season without two of their premier options: Michael Crabtree (Achilles) and Mario Manningham (knee).

Marlon Moore, meanwhile, embraced his chance Tuesday to line up alongside Boldin as the first-team wideouts.

“It is a big opportunity for me and every receiver,” Moore said. “We know what’s at stake. All I can do is make plays when I get opportunities. Coaches will make the right decision on who they want.”

Moore, a Sacramento native, caught only 12 passes the past three seasons with the Miami Dolphins, where he also excelled on special teams with what he calls his “element of toughness.”

Others who saw more reps and floated up the depth chart with recent injuries are Chad Hall, Charly Martin and Chuck Jacobs.

A week into camp, there’s no question Boldin is far and away the 49ers’ most polished receiver, and his fellow receivers take notice.

“We watch him in one-on-one drills, we see him in film study even when he was on the Ravens, and he’s just so strong and sound on the field,” Moore said.

While Boldin had a monster practice catching a slew of passes from Kaepernick, Davis provided the play of the day when he beat linebacker Patrick Willis and safety C.J. Spillman for a 50-yard catch.

“The athleticism Kap has and the arm he has, there’s no reason he and Vernon shouldn’t hook up with those passes,” Willis said.

Davis is still lining up mainly at tight end and not wideout. On Tuesday, he had a snap as a slot receiver, none at wideout. That’s not to say Davis doesn’t possess the speed to play wide receiver.

“Vernon was able to turn on another gear,” Willis said of Tuesday’s deep reception. “That’s not even fair.”

On Sunday, Davis said of his versatility: “I’m willing to step up and do whatever they ask me to do. They’ve been having me work with the wide receivers, line up with the wide receivers, pretty much all over the place.”

For more on the 49ers, see Cam Inman’s Hot Read blog at blogs.mercurynews.com/49ers. Follow him on Twitter at twitter.com/CamInman.