Ibrahimovic has just five months left on his contract at Old Trafford and Schmid refused to rule out a move at some point.
"There's been a lot of talk about it in the past and it's something that maybe gets opened up again," he told the club's website of a possible move.
"I don't know what's there. If there was something there, I'm sure we'd all know.
"Right now, it's all rumours."