He played college football at Montana and Texas and was signed by the Dallas Cowboys as an undrafted free agent after the 1983 NFL draft.

He received interest from the University of Montana, who initially offered a partial football scholarship, that did not include expenses for lodging, books and meals.

Allegre declined the offer and the school countered with a full scholarship, although it didn't have an engineering program as he wanted.

[4] In 1986, after New York Giants' kicker Ali Haji-Sheikh was injured, the team began auditions to find a replacement.

Allegre's two-week tryout was successful, kicking a 57-yard field goal that convinced Coach Bill Parcells to sign him.

After three ineffective performances by Cooper, Parcells called Allegre back and signed him on September 25, becoming the team's sixth kicker in 19 games.

During the team's Super Bowl run in 1986, he kicked game-winning field goals in consecutive weeks in a crucial mid-season stretch.

He missed a field goal against the Atlanta Falcons in preseason, before losing the position battle to Ian Howfield and being released on August 19.

In the season finale at Miami, Allegre tied the score in the waning moments and later won the game 23-20 and a playoff berth for the Jets in an overtime thriller.

Allegre lost the competition for the kicker's spot on the Jets roster in training camp to Plan B free agency addition Jason Staurovsky and was released on August 28, 1992.

Allegre was later offered a position for a Dallas Cowboys pre-game show, and later eventually leading to his current work as color commentator for Monday Night Football with Álvaro Martín for ESPN in Latin America.