The Pride said in a statement Morgan had a patella stress reaction in her right knee stemming from an injury sustained while with the national team.
It s obviously difficult to lose a player of Alex s calibre due to injury, Pride general manager Erik Ustruck said.
However, after consulting with the club’s medical team at Orlando Health and U.S. Soccer, we felt it was in the best interest of Alex s long-term health to shut her down for the season to focus on the rehabilitation process and take the appropriate time to recover from the lingering knee injury.
The striker has been nursing the injury since she was substituted during USA s group game against Sweden at the World Cup in June.
She returned to play in the remaining games of the tournament, won by USA as they defended their title, even scoring a goal in a semi-final victory over England.
Morgan, who has played six games with the Pride this season, four before the World Cup and two since, has a history of knee injuries.
She suffered a torn anterior cruciate ligament as a teenager in high school and also underwent keyhole surgery on her right knee in 2015.
Morgan, along with USA team-mate Megan Rapinoe, has been nominated for The Best FIFA Women s Player award, with the winner to be announced at a ceremony in Milan on September 23.
