According to reports in Brazil, the 26-year-old has been told by his potential new club that he needs to undergo more medical examinations.
Anderson endured a miserable time during his long stay at Old Trafford, with numerous injuries hindering his progress, and Internacional want to make sure that there are no underlying problems before he pens a lucrative five-year-deal.
However, United are confident that Anderson will finally be off their books, although Louis van Gaal is making plans to accommodate the Brazilian back into first-team proceedings should the move fall through.
GETTY
Anderson is hopeful of leaving Man Utd for Internacional
I want to wish good luck to my friend Anderson, who is back to football in his native Brazil
Juan Mata
And taking to his blog, Juan Mata wished his friend all the best for a new start away from United.
The Spaniard said: "I want to wish good luck to my friend Anderson, who is back to football in his native Brazil. All the best, my friend!"
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