[2] On September 27, 1941, Grigas gained national attention after he rushed for 192 yards on 26 carries and scored all three Holy Cross touchdown in a 19–13 victory over LSU at Baton Rouge, Louisiana.

[4] At the end of his junior season, Grigas was selected by the International News Service as a second-team back on its 1941 College Football All-America Team,[5] and by the Newspaper Enterprise Association as a third-team All-American.

[6] On November 28, 1942, Grigas was responsible for four touchdowns (two rushing, two passing) in a 55–12 upset victory over undefeated Boston College.

[9] Grigas instead opted to play professional football after being selected by the Chicago Cardinals in the second round, 14th overall pick, of the 1943 NFL draft.

[1] During the 1943 season, Grigas appeared in all 10 games, principally as a fullback, for a Chicago Cardinals team that compiled a winless 0–10 record.

[1] During the 1944 season, Grigas appeared in nine games for the Card-Pitt (a temporary wartime merger of the Pittsburgh Steelers and Chicago Cardinals), a team that compiled a winless 0–10 record.

"[15] Chicago coach Phil Handler later explained Grigas decision as follows:"He worked days in a steel mill at a job where he had to stand all the time.

"[16]In early September 1945, the Boston Yanks acquired Grigas from the Cardinals in exchange for reserve list players and cash.

[1] After retiring from the NFL, Grigas worked for 35 years as an industrial engineer for the American Optical Co. in Southbridge, Massachusetts.