Pogba, 18, is one of the most highly-rated players to emerge from the United academy in recent times, but he is out of contract in the summer and has now reportedly agreed a £15,000-a-week deal with Juve.
The speculation was strengthened when he did not feature for the reserve team's defeat to West Brom on Tuesday and trained away from the first-team on Wednesday, but Ferguson said he was unsure of the player's plans.
"I can't tell you anything about it because I do not know," Ferguson said.
Meanwhile, Ferguson said goalkeeper Anders Lindegaard is likely to return to first-team action in two or three weeks.
The Denmark international had moved ahead of David de Gea in the pecking order before sustaining an ankle injury at the end of January, but he is likely to be back in the first-team picture by the end of the month.
"Anders is doing all the running now," he said. "It will be another two or three weeks before he gets into the football side but he is progressing very well."
Ferguson also confirmed midfielder Paul Scholes had missed training on Wednesday morning to do some gym work and that fellow midfielders Anderson and Tom Cleverley were available to face Athletic Bilbao on Thursday after recent injuries.