Ferguson spent the summer trying to convince Tevez to sing a permanent deal at Old Trafford, but instead the 25-year-old joined Manchester City.
Tevez has been a hit at Eastlands, having already scored 15 goals for the club.
“What Tevez is doing now is not an issue for me,” he said.
“We made a pitch, he didn’t take it, and he went to City. It’s no problem for us, we have moved on.
“It’s not the end of the world for us. He’s done well and so be it, but I’ve got no issues about it.”