The 34-year-old Morgan competed for Team USA in every Olympics from Beijing 2008 and took home the gold medal in London 2012.
After recently recuperating from an ankle ailment, the two-time World Cup winner, who has scored 123 goals for her country, has not scored in her last eight games for San Diego Wave.
Morgan posted on social media, “I’m disappointed not to have the chance to represent my country on the Olympic stage today.”
“I will always hold a special place in my heart for this tournament, and I take great delight in wearing the crest every time.
I am excited to be rooting for this squad and encouraging them along with the rest of our nation in less than a month.
Hayes, a former manager of Chelsea, will oversee her debut tournament as a US manager. Her primary choices for forwards are Jaedyn Shaw, Sophia Smith, Trinity Rodman, and Mallory Swanson.
In the last camp, I had the rare chance to work with her, and I witnessed firsthand not just her abilities but also her professionalism and track record, which speaks for itself, Hayes added.
Naturally, it was a difficult choice to make given that there are only 16 outfield players and two goalkeepers on an 18-man roster, especially in light of Alex’s track record and experience with this squad.