"I remember when I went back to Newcastle from Birmingham, I didn't think I'd ever stay there. I got booed coming onto the pitch against Villarreal.
I came on, scored two headers and I still got booed coming off the pitch," Butt said.
"I was thinking there's no way I'm going to end up staying, they're not going to accept me.
But I trained, worked hard and played, ended up being captain of the club and staying another four years," he added.
Butt concluded that while remaining in Spain would have been preferable, the absence of alternative transfer agreements necessitates a structured integration back into the Premier League squad.
"It would obviously be better for him to stay at Barcelona than go back to Man United.
The club might have made their mind up but, again, if he comes back to pre-season contracted as a Man United player, Michael will give him respect and consideration," Butt said.
As reported by Yahoo Sports, Rashford is currently focused on the World Cup tournament with England ahead of their opening match against Croatia on Wednesday.
