Former San Francisco 49ers linebacker Chris Borland said in a national TV interview Sunday that he would be voluntarily returning three quarters, or $463,077, of the $617,436 signing bonus he received, as reported by Comcast Sportsnet.

Last week, the 24-year-old announced that he was retiring from football, citing the health risks brought about by his concern of repeated head trauma, which he said could lead to long-term damage to his brain.

The Comcast Sportsnet report noted that Borland did not sustain a documented concussion during his rookie season, but said he endured a hit to his head during training camp that ultimately triggered his decision to step away from the game.

On an episode of "Face the Nation," Borland was asked if he was having any regrets stemming from his decision.

"Absolutely not. To play one year, it's not a cash grab as I've been accused of. I'm paying back three-fourths of my signing bonus. I'm only taking the money I've earned," Borland replied.

He signed a mandatory four-year contract as the 49ers third-round draft pick last season. According to the NFL's collective bargaining agreement, the 49ers have the right to get back a pro-rated portion of the money paid to Borland after the linebacker retired after just one season.

"The 49ers drafted me assuming I wanted to play more than one year. At the time, I did too. Things changed. They didn't deserve to be undercut, and I didn't want that to happen," Borland said in an appearance on "CBS This Morning."

In a previous Comcast Sportsnet report, 49ers general manager Trent Baalke admitted he made an "exception" when drafted Borland citing his lack of the standard physical tools.

"We talked about that principle. Is this a guy you're willing to make an exception on? And if so, why? And the reason you make exceptions is because they're productive players at their position. They've proven they can overcome limitations or liabilities they have physically," he said.