Tampa Bay Buccaneers

The younger brother of NFL star Mike Williams has turned himself in to authorities ... though Mike is now telling cops the whole thing was an accident and he "fell" on the knife his bro was holding.

Mike's brother, Eric Baylor, was taken into custody last night ... he's facing battery and domestic violence charges for allegedly stabbing the Tampa Bay Bucs receiver in the left thigh.

But cops say ... despite multiple witnesses who say the two had been arguing before the stabbing, Mike is NOT blaming his brother.

"[Mike's] account is that they were horsing around in the kitchen and he fell on the knife that his brother was holding," a rep for the Sheriff's Office says.

Suuuuuure.

An arrest warrant has been issued for the brother of NFL star Mike Williams ... after cops say he stabbed the Tampa Bay Bucs wide out during an altercation in the player's Tampa home ... TMZ Sports has learned.

Officials say 26-year-old Williams was stabbed in the left thigh (above the knee) Sunday afternoon ... however they have not released information about the severity of the injury.

Cops tell TMZ Sports ... investigators spoke to witnesses and a warrant was issued for Eric Baylor for aggravated battery and domestic violence.

Williams -- who signed a $40 million contract with the Bucs last year -- was rushed to a nearby hospital where he's being treated.

The Tampa Bay Buccaneers are finally making some progress ... at least when it comes to fashion ... because TWO top couture designers tell us the new Bucs uniforms are downright SEXY!

TMZ Sports spoke with "Project Runway" alum Michael Costello -- who also designed Beyonce's Grammy dress -- and he tells us he's all about the change in Tampa Bay.

"I LOVE the new uniform," Costello says ... "It's fresh, it's cool. It's a lot sexier. The old one looked like a t-shirt."

We also spoke with celeb stylist/designer June Ambrose ... who's worked with huge stars like Jay Z and Diddy ... who's also fired up for the Bucs' new uni to hit the field.

"The look reminds me of this wild black bird! It's a sexy suit ... looks like it's ready for the runway!"

Ambrose adds, "I love how it minimizes the tight end of the players tail. The suit is sleek and super powerful! All the ingredients for the iconic class."

It's good news for the Bucs -- 'cause as Deion Sanders once said: "If you look good, you feel good. If you feel good, you play good. If you play good, they pay good."

Former NFL wide receiver Michael Clayton has been friends with Lil Boosie since they were kids -- and he tells TMZ Sports he's VERY EXCITED his "dawg" is finally out of prison.

Boosie was released from Louisiana State Penitentiary on Wednesday, where the rapper had been locked up since 2009 for drugs.

Now that Boosie's free, Clayton -- who was a beast on the Tampa Bay Bucs -- says, "For me, it feels really good that he's out."

"He's got a sweet soul," Clayton says ... "He took care of a lot of people before he went to prison."

Clayton says he just spoke with Boosie's mother -- who says she's "very happy to have her baby home."

Michael -- who stayed in touch with Boosie throughout his prison stint -- is also optimistic that Boosie left the pokey a changed man.

"He learned a good lesson," Michael says ... "Sometimes being behind them bars helps you learn."