MIAMI -- NCAA investigators visited the University of Miami campus Monday looking into claims that more than a dozen former or current football players received gifts and services from convicted Ponzi schemer Nevin Shapiro, his attorney said.

Shapiro has told the NCAA he provided players with the use of a yacht and other favors, said his attorney, Maria Elena Perez. Shapiro and Perez have been talking with the NCAA about the matter for a couple of months and provided documentation, she said.

University officials didn't immediately respond to requests for comment. School officials and current players were expected to be interviewed.