More trouble for Warren Sapp ... the NFL Hall of Famer has been named a suspect in a domestic violence investigation in Las Vegas ... TMZ Sports has learned. <br />Law enforcement sources tell us ... a report has been filed against Sapp in which the 42-year-old is accused of getting into a physical altercation with a woman in a casino on April 28th. <br />We're told cops met with the alleged victim at a different location after the incident and took a report ... though Sapp was not present at that time. Law enforcement sources tell us the woman appeared to have suffered minor injuries. <br />Our sources tell us Sapp has NOT been arrested or charged with a crime at this point ... though cops are still investigating. <br />It's just the latest legal problem for Sapp ... who was arrested for soliciting and assaulting two prostitutes in Arizona back in February. <br />We reached out to Sapp for comment ... so far, no word back.
