Winger Snodgrass was handed the skipper's armband in Warnock's first official game in charge at Portsmouth at the weekend, taking over from goalkeeper Andy Lonergan.
Warnock told the club's official website: "I had a chat with Andy and it's nothing against him. I've never known a goalkeeper as captain and I think he was quite relieved really.
"He's taken it on board and wished Snods all the best. I said to Snods he'll be captain for the rest of the season and we'll see where we go."
Warnock feels the Scotland international can play a crucial role between now and the end of the season, adding: "He got frustrated in the first half [at Portsmouth] because we couldn't get the ball to him and it was like Wacky Races at times.
"But I thought he had a lot of the ball in the second half. He can't get frustrated because he can cause a lot of problems."