The 28-year-old, who is married to former Norwich City youngster Dom Dwyer, is expecting her second child.
She wrote on Instagram: "I didn't think I'd be starting off preseason 5.5 months pregnant but here we are."
Leroux, an Olympic gold medallist and World Cup winner, was described as a "legend."
One person wrote: "This is awesome on so many levels".
Another said Leroux is an "inspiration to all lady ballers".
Leroux was then asked what training she can actually do – with contact clearly out of the question.
She replied: "I just do non-contact stuff. Ball work. Getting touches in.
"I don't put myself in situations where the ball can ricochet or I can get hit.
"No high intensity running and I listen to my OB (who knows more than people on twitter telling me what I shouldn't be doing with MY body.)"
Orlando team-mate and USA star Alex Morgan said: "Proud to be your team-mate Syd.
"Can’t wait to get on the field with you."
Sydney and Dom have another son, Cassius.
The couple's second child is expected on July 4 – she had fallen pregnant a year earlier but then suffered a miscarriage.
She then missed a month of last season because of illness, which she later confirmed had been because of pregnancy.
Sydney said in October: "I was naive to the pain of what this felt like. There was a moment when I was on bed rest where I wondered if the emotional pain could kill me.
"There was a sense of shame and embarrassment that came with losing a baby. Except the statistic of losing a baby is 1 in 4. Which means there are so many of us going about our day trying to bury our grief and pain."
Dwyer, 28, spent six years in Norwich's academy before moving to the US to study after winning a college degree.
He was later drafted to Major League Soccer, where he has played for Sporting Kansas City and now Orlando City Dwyer won four USA caps in 2017.
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