Currently on-loan at Aston Villa this season, Sancho's deal with United will expire at the end of the season.
Asked about the winger ahead of Sundays clash with Villa, Carrick said: “You can never be surprised with anything in football. It’s one of those things.
“Sometimes you come to a club. Sometimes it works, sometimes it doesn’t quite work. That’s natural, it happens at every club.
“Jadon’s got talent. That’s why he came to the club to start with, and he’s had some really good moments.
“And for whatever reason, I don’t know, I’ve not been here for a period of time, he’s ended up finding himself at Aston Villa.
“He had a good spell at Dortmund as well in the Champions League final, so he certainly got talent and he’s playing a lot this season.
“So credit to him for that and he’s having an impact, playing a lot of games. What happens next and how to move forward, then we’ll just have to wait and see.”