Andreoli was a member of the Crusader basketball team from 1955-1958. After playing in 16 games as a backup on the 1955-1956 team which won the New England championship and advanced to the NCAA Tournament, he became a starter during his junior season and averaged 18.1 points and 6.0 rebounds per contest. Andreoli led the 1956-1957 team in field goal percentage (41.5) and scored a career-high 31 points in an 89-65 victory over Boston College. As a senior, Andreoli let his scoring take a backseat to his playmaking ability, but still averaged 12.0 points and 4.6 rebounds per game. Over the course of his Holy Cross career, he totaled 737 points and 277 rebounds, while making 264 of 668 field goal attempts (39.5 percent) and 209 of 312 free throws (67.0 percent).