Browns offensive tackle Joe Thomas recently said Manziel "lost a lot of trust" among his teammates after he was named the starter late last season. Manziel got his first start in Week 15 against the Cincinnati Bengals, going 10-18 for 80 yards and two interceptions in a 30-0 loss.
Mack told Sirius XM that he doesn't think Manziel needs to earn his trust back.
Manziel, the Browns' first round pick in 2014, has been in a treatment facility for an undisclosed problem since late January and is expected to leave rehab soon. Browns general manager Ray Farmer said that it is possible that the quarterback could join the team for offseason workouts, which start April 20.
ESPN's Christ Mortensen reported last week that the Browns might have "moved on" from Manziel.
- Molly Geary