Michigan and Notre Dame, which played each other in football only twice from 1909 to 1977, agreed Monday to continue to play each other annually through 2031. The schools were scheduled to meet each season through 2011. They agreed Monday to a 20-year contract extension. "We are thrilled that the series between two premier college football programs will continue uninterrupted for the next 25 years," Michigan Athletic Director Bill Martin said in a release.