ANN ARBOR, Mich. (AP) -The University of Michigan says the beleaguered football program failed to file mandatory monthly logs that track how much players work out and practice.

The NCAA is investigating whether Michigan violated its rules by holding more training sessions than is allowed.

University auditors were unable to find reports used to document how much time football players spend in the work room and on the practice field. Its report said: ``At the time of the review, which was after the 2008-2009 season, no logs had been submitted by football coaches.''

Coach Rich Rodriguez has said his program obeyed NCAA rules.

The Detroit News first reported the audit results Monday.