09:25 AM ET 06.15 | Sarah Thomas spent three days at the Colts minicamp as part of the NFL's officiating development program, and league officials say she would be the first woman to reach NFL fields through the program. She's expected to join the Colts in training camp next month and could call some preseason games this year. Once completing the development program, Thomas could get a shot at the regular season if a spot becomes available. That wouldn't happen until a current official retires or leaves the league. "It's just something that happened," said Dean Blandino, the NFL's vice president of officiating. "She was in our pipeline for a while." Last year, Shannon Eastin became the first woman to be an official in both a preseason and regular-season NFL game. She was a line judge in the Rams-Lions season opener, among the replacements hired during the officials' lockout.