Allegretti played as an offensive lineman for the Illinois Fighting Illini, starting as a freshman in the 2014 season.[2] He remained with the Illinois program for the entirety of his collegiate career, with the 2018 season being his last with the team. He redshirted his first season at Illinois. Afterwards, he would play in 48 consecutive games, including as a starter in the last 36 games of his collegiate career.[1][3]
Allegretti was selected by the Kansas City Chiefs in the seventh round with the 216th overall pick in the 2019 NFL draft.[5] Allegretti played seven games during his rookie season of 2019.[6] He won Super Bowl LIV with the Chiefs when they defeated the San Francisco 49ers by a score of 31–20.[7] In the 2020 season, Allegretti appeared in all 16 regular season games and started nine. He started in the Chiefs' three postseason games that year.[8] In the 2021 season, he mainly played in backup role except for Week 17 against the Bengals.[9] He scored his first touchdown on a one-yard reception against the Pittsburgh Steelers in the Wild Card Round of the playoffs on January 16, 2022.[10] In the 2022 season, Allegretti appeared in 17 regular season games and started three.[11] He became a Super Bowl champion for the second time when the Chiefs defeated the Philadelphia Eagles in Super Bowl LVII 38–35.[12]
On March 17, 2023, Allegretti re-signed with the Chiefs.[13] After mostly being a backup throughout the season, Allegretti became the Chiefs starter for the AFC Championship Game and Super Bowl LVIII after Joe Thuney got injured. The Chiefs won both games and Allegretti won his third Super Bowl ring, despite playing much of the Super Bowl with a torn UCL.[14][15]
Allegretti and his wife, Christina, have twin daughters. His twins were born on the morning of February 12, 2023, the same day Allegretti won Super Bowl LVII, his second championship.[18]
