It is hard to consider someone underrated when you were a member of the only undefeated team in NFL history and were in your prime when you earned your two Super Bowl Rings, but this is what we have in Bill Stanfill.

Ray Wietecha played his entire 10-year NFL career with the New York Giants, where he was the literal centerpiece (he played Center) of a robust Offensive Line.  Helping the G-Men to an NFL Championship in 1956, Wietecha would have better individual seasons after going to four Pro Bowls and earning a First Team All-Pro nod.  In his last season (1962), he was named a Second Team All-Pro and arguably could have continued his playing career, but he elected to become a coach instead.

E.J. Holub was an All-American at Texas Tech, where he was such a great player that the Red Raiders would later retire his number.  Drafted 6^th Overall by the Dallas Texans in 1961, Holub played at Linebacker, and in the first five of his six years, he was an AFL All-Star and was named a First Team All-Pro in both 1962 and 1963.  In those two seasons, he finished sixth and third respectively, in Approximate Value, a testament to his skill.