That is the view of manager Mauricio Pochettino, who outlined Sterling's condition ahead of their game on Monday against Everton.
The veteran winger has faced a lot of criticism from supporters for his poor displays in recent months.
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Pochettino told reporters on Friday: "He sent a text last night or this morning, I don't know, to the doctor saying that he was vomiting."
Enzo Fernandez and Axel Disasi are also likely to miss the Everton game due to injuries.
Ben Chilwell is still a doubt, as he had fluid drained from his knee after a recent England game.