Ledley, a target for hometown club Cardiff City, and Samaras, who is attracting interest from Hull City, both come out of contract in the summer with Mjallby suggesting there could be some changes at Celtic Park either in the January transfer window or at the end of the campaign.
"There is no concern whatsoever," he said. "They are two great professionals and I think Joe Ledley has been playing very well recently.
"The way I understand it is that there are offers on the table and the sooner we get an answer from them the better because we need to look further ahead, we can't just look towards the next couple of weeks.
"If they are not likely to be here, then we would like to get some money for them and would probably look for replacements in those areas."
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