Alan Stubbs says he is confident that striker Jason Cummings will still be a Hibernian player at the end of the January transfer window.
The 20-year-old has scored 16 goals so far this season and is attracting interest from clubs from England.
"We are very relaxed; we're in control of the situation," Stubbs said.
"It would have to be something serious to make us even consider having a discussion about it. It's going to take a substantial amount of money."
Cummings has spearheaded Hibs' challenge for promotion to the Premiership, with his side currently third in the Championship, three points behind leaders Rangers.
Stubbs is confident Cummings will be able to put all the speculation about his future to one side and continue to his excellent goal-scoring form.
"Jason, myself, the club, we are very relaxed about it," Stubbs told BBC Scotland.
"Jason is doing all his talking where he should be and that's on the pitch. While he's doing that and he's scoring goals there will always be speculation. We can't do anything to stop that.
"I've spoken to Jason regularly about this. He just needs to keep concentrating on what's going on on the pitch. Everything else will fall into place off it.
Stubbs concedes that the day will come when Cummings moves on to a bigger club, but feels that should only happen when the time is right.
"If you keep scoring, you get the attentions of even bigger clubs. That's ultimately what one day we want Jason to do. We want him to play at the very highest level.
"The only way to do that is, yes there is speculation, but being strong enough to play through that and keep focussing on what he does best which is score goals."