The Prime Minister lambasted football's ruling body, saying that it should "get its own house in order" before telling the country's footballers what to do.
Speaking at Prime Minister's Questions, Mrs May said: "I think the stance that has been taken by FIFA is utterly outrageous.
"Our football players want to recognise and respect those who have given their lives for our safety and security. I think it is absolutely right that they should be able to do so.
"I think a clear message is going from this house we want our players to be able to wear those poppies and I have to say to FIFA that before they start telling us what to do they jolly well ought to sort their own house out."