The sportswear giant Nike confirmed on Thursday that it had ended its sponsorship of Antonio Brown in the wake of a lawsuit accusing the New England Patriots wide receiver of rape.

“Antonio Brown is not a Nike athlete,” said Sandra Carreon-John, a Nike spokeswoman. She did not respond to questions about what prompted the termination.

Through his lawyer, Brown has denied the allegation. The N.F.L. is investigating and has opted not to suspend Brown while it does.

Brown spoke to reporters after practice on Thursday, in his first public comments since the lawsuit was filed. “I’m just here to focus on ball and look forward to get out there in the home stadium with the team,” Brown said.