"There haven't been any approaches for him and, right now, I don't think Thomas is in a position to just choose a club," said Sivebaek. "He hasn't played a lot this season and that doesn't make things any easier for us.
"There were rumours in the press about Blackburn Rovers making an offer, but I certainly didn't speak with them.
"We will hold talks with Celtic because, for the moment, we do not know what the future is. But, as far I can see, at this stage the only option for him is to go back to Glasgow and try to get back into the team."