And Capello mentioned Hargreaves as a serious candidate to play following his side's disappointing 2-2 draw with Czech Republic at Wembley earlier this month.
But Ferguson said the 27-year-old was not ready for the rigours of international football.
"Anyone could play against Andorra. But Croatia is different - you need players who are 100%," he said.
"We sent Owen to the right specialist and he had the right treatment, so it is just a matter of him getting on with it now.
"It has not been easy for him. Having tendinitis can be irritating for a player.
"But he has trained for 10 days and it is now important to give him some minutes on the pitch.
"I think it (the England games) will be too early for him. He is not ready for that."
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