COLLEGE STATION, Texas -- Texas A&M started spring practice on Friday without two defensive starters.

Sophomore linebacker Darian Claiborne and sophomore defensive tackle Isaiah Golden are continuing to serve their indefinite suspensions after both were arrested on separate charges early Sunday morning.

Texas A&M athletic department spokesman Alan Cannon said on Monday that both were immediately suspended from all athletic activities per department policy. Coach Kevin Sumlin, who made his first public comments on the pair since their arrests, said it is unclear when they will return to practice.

"No timeline," Sumlin said. "Pending investigation and everything else, they're suspended indefinitely."

Golden, 19, faces a marijuana possession charge of less than two ounces; Claiborne was charged with a noise violation. Both were in a car parked in a handicap spot at an apartment complex at the time of their arrests. Both were released Sunday on bond. It was the second arrest in three months for Claiborne, who was charged with marijuana possession in December and subsequently suspended for the Chick-fil-A Bowl.

Golden appeared in 11 games (six starts) for the Aggies last season. Claiborne, an All-SEC freshman team selection in 2013, appeared in 12 contests (nine starts).

Sumlin expressed concern over the off-field decisions his players made.

"It's a concern," he said. "Every program faces challenges, not just during the offseason, but during the season. I think we do a great job of educating our players, and it's an ongoing process.

"I don't think there's a coach alive out there right now that doesn't go to bed and worry about phone calls. For the most part, our guys have done a good job of handling things off the field. We've got [some] guys that have made a few poor choices since we've been here, we've disciplined them, we'll continue to discipline them, we've been consistent in what we're doing."