In February 1989, Manca signed with the
Dallas Cowboys, after a try-out at a
free agent kicking combine in
Reno, Nevada. He would become a part of Cowboys lore during a March
mini-camp, when he was required to run a series of sixteen 110-yard sprints with the rest of the team, but needed to rest after the eighth run. Then new head coach
Jimmy Johnson confronted Manca, who mentioned he suffered from asthma, although the accounts vary of the exchanged that followed, it was later reported in the media that an angry Johnson replied "Asthma, my ass. The asthma field is over there", while pointing to the parking lot at the Cowboys Valley Ranch complex.
[9][10] He was released on August 12.
[11]