Several people have expressed concern this week over the whereabouts and well-being of Adam Muema, the former San Diego State running back who, citing religious reasons, skipped activities this weekend at the NFL Scouting Combine.

Sources said Tuesday afternoon that Aztecs coaches haven't spoken to Muema since he left Indianapolis. Neither have others tasked with assisting the 21-year-old in the draft process.

A San Diego State spokesman did not return messages seeking comment.

“I have no idea where is,” a person close to Muema said. “(San Diego State coaches) have been trying to track him down, too. Every time they do, his phone is off. ... It's a frustrating deal.”

"It's a big mystery," said Lou Farrar, Muema's former football coach at Charter Oak High. "At this point, we just hope he's safe. As long as he's safe. That's all that really matters.”

It would be premature, based on information available, to classify Muema as missing; his closest family relative declined comment on the matter, and Muema warned Sunday he'd be laying low for the foreseeable future.

"(God) told me to sit down, be quiet, and enjoy the peace," he said.

At the very least, the tight circle he's kept since leaving the combine casts a mysterious afterglow to what occurred.

Muema fulfilled his media obligation Friday, expressing an eagerness to do the 225-pound bench press on Saturday and 40-yard dash on Sunday. Ultimately, he partook in neither. From the Indianapolis International Airport, he explained Sunday he was "following God," who told him that if he did not participate in workouts, he'd fulfill his dream of playing for the Seattle Seahawks.

At this stage, it is unclear whether Muema will participate in his pro day next month at San Diego State.

The entire situation may gain more clarity Wednesday when the Aztecs open spring football. Coach Rocky Long is scheduled to address reporters following a 4 p.m. practice.

A former San Diego State teammate, who agreed to speak Tuesday on the condition of anonymity, described Muema as being family oriented and “always really religious.”

“He talked about how close he was with God,” the ex-teammate said, “but (what happened) was a little bit of a surprise. … I wish him nothing but the best. He's a great kid.”

Others close to Muema echoed that they were aware of his strong religious convictions but didn't expect them to manifest as they did. It is clear his beliefs didn't begin in Indianapolis.