Carl Nassib -- the first openly gay player to ever log time in a regular season NFL game -- is retiring. The 30-year-old pass rusher announced the news in a lengthy post on his Instagram page Wednesday morning ... revealing he's hanging up his cleats in order to focus on his business endeavors.…

Carl Nassib -- the NFL's only openly gay player -- will be showing his support for the LGBTQ+ community on Sunday ... by wearing a pair of custom rainbow cleats. The Raiders pass rusher -- who came out as gay earlier this year -- revealed the unique footwear this week ... announcing he'd be…