The NFL's training camps are underway, and Colin Kaepernick is still a free agent quarterback.

The former 49ers QB has allegedly been "blacklisted" by teams across the league due to his national anthem protests from last season, and he has received some advice from former NFL stars about how to get back in the good graces of the league.

First, Mike Vick advised Kaepernick to cut his hair.

Today, Ray Lewis has chimed in.

In a video posted to his twitter account, the 2x Super Bowl MVP encouraged Kaepernick to keep quiet about his social activism off the field, and let his play speak for itself. 

"If you do nothing else, young man, get back on the football field and let your play speak for itself. And what you do off the field, don't let too many people know because they are going to judge you anyway, no matter what you do, no matter if it's good or bad."

"I haven't got anything against you, I wish you the best in life," Lewis said. "I hope you chase whatever God got for you to chase. And once again, I applaud what you stood up for, because I'm in the streets every day."

According to ESPN, the Baltimore Ravens are still thinking about whether or not to sign Kaepernick, and owner Steve Bisciotti recently said that he has consulted Lewis in the decision-making process.

Check out Ray's comments below.